[Galaxy S II Original Android Development] Andromepat:
Your luck, error is still present. I installed the APK and everything was fine - till next reboot. So I tried to start PlayStore, it closes, I made a logcat via Slim's bugreport feature. As for logcat, the following is enough?

I/ActivityManager( 2195): Start proc com.android.vending for broadcast com.android.vending/com.google.android.finsky.receivers.BootCompletedReceiver: pid=3196 uid=10037 gids={50037, 3003, 1015, 1023, 1028}
E/AndroidRuntime( 3196): FATAL EXCEPTION: main
E/AndroidRuntime( 3196): java.lang.RuntimeException: Unable to instantiate application com.google.android.finsky.FinskyApp: java.lang.ClassNotFoundException: Didn't find class "com.google.android.finsky.FinskyApp" on path: DexPathList[[zip file "/system/app/Vending.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 3196):	at android.app.LoadedApk.makeApplication(LoadedApk.java:509)
E/AndroidRuntime( 3196):	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4601)
E/AndroidRuntime( 3196):	at android.app.ActivityThread.access$1300(ActivityThread.java:153)
E/AndroidRuntime( 3196):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1329)
E/AndroidRuntime( 3196):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 3196):	at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 3196):	at android.app.ActivityThread.main(ActivityThread.java:5287)
E/AndroidRuntime( 3196):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 3196):	at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime( 3196):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
E/AndroidRuntime( 3196):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
E/AndroidRuntime( 3196):	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 3196): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.finsky.FinskyApp" on path: DexPathList[[zip file "/system/app/Vending.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 3196):	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
E/AndroidRuntime( 3196):	at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
E/AndroidRuntime( 3196):	at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
E/AndroidRuntime( 3196):	at android.app.Instrumentation.newApplication(Instrumentation.java:975)
E/AndroidRuntime( 3196):	at android.app.LoadedApk.makeApplication(LoadedApk.java:504)
E/AndroidRuntime( 3196):	... 11 more

(...)

W/PackageManager( 2195): Not granting permission android.permission.SEND_DOWNLOAD_COMPLETED_INTENTS to package com.android.vending (protectionLevel=2 flags=0x8abe45)
W/PackageManager( 2195): Unknown permission android.permission.SEND_SMS_NO_CONFIRMATION in package com.android.vending

(...)

D/AndroidRuntime( 7840):
D/AndroidRuntime( 7840): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 7840): CheckJNI is OFF
D/dalvikvm( 7840): Trying to load lib libjavacore.so 0x0
D/dalvikvm( 7840): Added shared lib libjavacore.so 0x0
D/dalvikvm( 7840): Trying to load lib libnativehelper.so 0x0
D/dalvikvm( 7840): Added shared lib libnativehelper.so 0x0
W/InputMethodManagerService( 2195): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@424fb298 attribute=null, token = android.os.BinderProxy@42941cd8
D/AndroidRuntime( 7840): Calling main entry com.android.commands.am.Am
D/dalvikvm( 7840): Note: class Landroid/app/ActivityManagerNative; has 164 unimplemented (abstract) methods
D/AndroidRuntime( 7840): Shutting down VM
E/cutils-trace( 7840): Error opening trace file: No such file or directory (2)
D/dalvikvm( 7840): GC_CONCURRENT freed 93K, 16% free 527K/624K, paused 0ms+0ms, total 2ms
D/dalvikvm( 5550): GC_CONCURRENT freed 390K, 45% free 4266K/7716K, paused 8ms+5ms, total 99ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 544K, 15% free 15807K/18468K, paused 179ms, total 179ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 303K, 15% free 15794K/18468K, paused 90ms, total 90ms
D/BluetoothAdapter( 4610): 1110839688: getState() : mService = null. Returning STATE_OFF
D/dalvikvm( 5550): GC_EXPLICIT freed 17K, 45% free 4255K/7716K, paused 7ms+4ms, total 52ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 265K, 14% free 15946K/18468K, paused 171ms, total 172ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 302K, 15% free 15789K/18468K, paused 154ms, total 154ms
D/dalvikvm( 4610): GC_EXPLICIT freed 804K, 11% free 15275K/17160K, paused 13ms+18ms, total 190ms
I/ActivityManager( 2195): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.APP_MARKET] flg=0x14008000 cmp=com.android.vending/.AssetBrowserActivity} from pid 6796
D/dalvikvm( 2195): GC_FOR_ALLOC freed 314K, 14% free 15992K/18468K, paused 140ms, total 141ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 323K, 15% free 15866K/18468K, paused 84ms, total 84ms
I/ActivityManager( 2195): Start proc com.android.vending for activity com.android.vending/.AssetBrowserActivity: pid=7860 uid=10037 gids={50037, 3003, 1015, 1023, 1028}
W/InputMethodManagerService( 2195): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@426f09a0 attribute=null, token = android.os.BinderProxy@429406e0
E/dalvikvm( 7860): Dex cache directory isn't writable: /cache/dalvik-cache
I/dalvikvm( 7860): Unable to open or create cache for /system/app/Vending.apk (/cache/dalvik-cache/system@app@Vending.apk@classes.dex)
D/AndroidRuntime( 7860): Shutting down VM
W/dalvikvm( 7860): threadid=1: thread exiting with uncaught exception (group=0x41d8b700)
E/AndroidRuntime( 7860): FATAL EXCEPTION: main
E/AndroidRuntime( 7860): java.lang.RuntimeException: Unable to instantiate application com.google.android.finsky.FinskyApp: java.lang.ClassNotFoundException: Didn't find class "com.google.android.finsky.FinskyApp" on path: DexPathList[[zip file "/system/app/Vending.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 7860):	at android.app.LoadedApk.makeApplication(LoadedApk.java:509)
E/AndroidRuntime( 7860):	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4601)
E/AndroidRuntime( 7860):	at android.app.ActivityThread.access$1300(ActivityThread.java:153)
E/AndroidRuntime( 7860):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1329)
E/AndroidRuntime( 7860):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 7860):	at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 7860):	at android.app.ActivityThread.main(ActivityThread.java:5287)
E/AndroidRuntime( 7860):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 7860):	at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime( 7860):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
E/AndroidRuntime( 7860):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
E/AndroidRuntime( 7860):	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 7860): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.finsky.FinskyApp" on path: DexPathList[[zip file "/system/app/Vending.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
E/AndroidRuntime( 7860):	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
E/AndroidRuntime( 7860):	at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
E/AndroidRuntime( 7860):	at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
E/AndroidRuntime( 7860):	at android.app.Instrumentation.newApplication(Instrumentation.java:975)
E/AndroidRuntime( 7860):	at android.app.LoadedApk.makeApplication(LoadedApk.java:504)
E/AndroidRuntime( 7860):	... 11 more
W/ActivityManager( 2195): Force finishing activity com.android.vending/.AssetBrowserActivity
D/dalvikvm( 2195): GC_FOR_ALLOC freed 337K, 14% free 15894K/18468K, paused 91ms, total 92ms
I/WindowManager( 2195): Screenshot Window{427f0218 u0 Starting com.android.vending} was all black! mSurfaceLayer=22030 minLayer=22030 maxLayer=22030
W/ActivityManager( 2195): Activity pause timeout for ActivityRecord{428f4060 u0 com.android.vending/.AssetBrowserActivity}
I/ActivityManager( 2195): No longer want com.tmobile.thememanager (pid 6824): empty #17
I/Process ( 7860): Sending signal. PID: 7860 SIG: 9
W/InputMethodManagerService( 2195): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@4290b858 attribute=null, token = android.os.BinderProxy@429406e0
I/ActivityManager( 2195): Process com.android.vending (pid 7860) has died.
I/ActivityManager( 2195): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.settings/.Settings bnds=[240,384][240,384]} from pid 6796
D/dalvikvm( 2195): JIT code cache reset in 4 ms (1048480 bytes 3/0)
D/dalvikvm( 2195): GC_FOR_ALLOC freed 497K, 14% free 15968K/18468K, paused 146ms, total 157ms
D/dalvikvm( 2195): GC_FOR_ALLOC freed 366K, 14% free 15900K/18468K, paused 89ms, total 89ms
D/BluetoothAdapter( 4610): 1110839688: getState() : mService = null. Returning STATE_OFF
D/WifiService( 2195): setWifiEnabled: true pid=4610, uid=1000
D/BluetoothAdapter( 4610): 1110839688: getState() : mService = null. Returning STATE_OFF
I/ActivityManager( 2195): Displayed com.android.settings/.Settings: +311ms (total +3s916ms)
I/ActivityManager( 2195): START u0 {cmp=com.slim.ota/com.slim.center.SlimCenter} from pid 4610
D/dalvikvm( 2195): GC_FOR_ALLOC freed 403K, 14% free 15913K/18468K, paused 141ms, total 142ms
D/su ( 7888): starting daemon client 10027 10027
D/su ( 7890): connecting client 7887
D/su ( 7892): remote pid: 7887
D/su ( 7893): remote atty: 0
D/su ( 7895): remote uid: 10027
D/su ( 7896): remote req pid: 5550
D/su ( 7897): remote args: 1
D/su ( 7902): su invoked.
D/su ( 7903): db allowed
D/su ( 7899): waiting for child exit
D/su ( 7905): 10027 /system/xbin/su executing 0 /system/bin/sh using binary /system/bin/sh : sh
D/dalvikvm( 5550): GC_CONCURRENT freed 329K, 42% free 4487K/7716K, paused 3ms+12ms, total 58ms
I/ActivityManager( 2195): Displayed com.slim.ota/com.slim.center.SlimCenter: +302ms
D/AndroidRuntime( 7904):
D/AndroidRuntime( 7904): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 7904): CheckJNI is OFF
D/dalvikvm( 7904): Trying to load lib libjavacore.so 0x0
D/dalvikvm( 7904): Added shared lib libjavacore.so 0x0
D/dalvikvm( 7904): Trying to load lib libnativehelper.so 0x0
D/dalvikvm( 7904): Added shared lib libnativehelper.so 0x0
E/cutils-trace( 7904): Error opening trace file: No such file or directory (2)
W/InputMethodManagerService( 2195): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@425a1a48 attribute=null, token = android.os.BinderProxy@42918190
D/AndroidRuntime( 7904): Calling main entry com.android.commands.am.Am
D/dalvikvm( 7904): Note: class Landroid/app/ActivityManagerNative; has 164 unimplemented (abstract) methods
D/AndroidRuntime( 7904): Shutting down VM
D/dalvikvm( 7904): GC_CONCURRENT freed 93K, 16% free 527K/624K, paused 0ms+0ms, total 2ms
D/dalvikvm( 5550): GC_CONCURRENT freed 519K, 41% free 4583K/7716K, paused 3ms+11ms, total 59ms
D/su ( 7918): starting daemon client 10027 10027
D/su ( 7920): connecting client 7917
D/su ( 7923): remote pid: 7917
D/su ( 7924): remote atty: 0
D/su ( 7925): remote uid: 10027
D/su ( 7926): starting daemon client 10027 10027
D/su ( 7927): remote req pid: 5550
D/su ( 7929): connecting client 7922
D/su ( 7930): remote args: 1
D/su ( 7933): remote pid: 7922
D/su ( 7938): su invoked.
D/su ( 7935): waiting for child exit
D/su ( 7939): remote atty: 0
D/su ( 7940): db allowed
D/su ( 7943): 10027 /system/xbin/su executing 0 /system/bin/sh using binary /system/bin/sh : sh
D/su ( 7941): remote uid: 10027
D/su ( 7946): remote req pid: 5550
D/su ( 7947): remote args: 1
D/su ( 7944): starting daemon client 10027 10027
D/su ( 7949): waiting for child exit
D/su ( 7952): su invoked.
D/su ( 7953): db allowed
D/su ( 7957): 10027 /system/xbin/su executing 0 /system/bin/sh using binary /system/bin/sh : sh
D/su ( 7959): child exited
D/su ( 7954): connecting client 7932
D/su ( 7960): client exited 0
D/su ( 7961): remote pid: 7932
D/su ( 7962): remote atty: 0
D/su ( 7963): remote uid: 10027
D/su ( 7964): remote req pid: 5550
D/su ( 7965): remote args: 1
D/su ( 7967): waiting for child exit
D/su ( 7970): su invoked.
D/su ( 7971): db allowed
D/su ( 7973): 10027 /system/xbin/su executing 0 /system/bin/sh using binary /system/bin/sh : sh