[Nexus 7 Android Development] pHaez:
In that case... here is a logcat.

I/ActivityManager( 374): START {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 pkg=com.dropbox.android cmp=com.dropbox.android/.activity.DropboxBrowser u=0} from pid 1506
I/ActivityManager( 374): Start proc com.dropbox.android for activity com.dropbox.android/.activity.DropboxBrowser: pid=6755 uid=10067 gids={3003, 1015, 1028}
I/ActivityThread( 6755): Pub com.dropbox.android.provider.SDK: com.dropbox.android.provider.SDKProvider
I/ActivityThread( 6755): Pub com.dropbox.android.CameraUploadsProvider: com.dropbox.android.provider.CameraUploadsProvider
I/ActivityThread( 6755): Pub com.dropbox.android.ZipperedUploadProvider: com.dropbox.android.provider.ZipperedUploadProvider
I/ActivityThread( 6755): Pub com.dropbox.android.UploadLog: com.dropbox.android.provider.UploadLogProvider
I/ActivityThread( 6755): Pub com.dropbox.android.ZipperedMediaProvider: com.dropbox.android.provider.ZipperedMediaProvider
I/ActivityThread( 6755): Pub com.dropbox.android.Dropbox: com.dropbox.android.provider.DropboxProvider
I/ActivityThread( 6755): Pub com.dropbox.android.LocalFile: com.dropbox.android.provider.FileSystemProvider
I/com.dropbox.android.service.DropboxNetworkReceiver( 6755): Setting receiver enabled: false
D/dalvikvm( 6755): GC_CONCURRENT freed 179K, 8% free 7491K/8071K, paused 11ms+1ms, total 30ms
I/com.dropbox.android.filemanager.a( 6755): No stored login token.
I/com.dropbox.android.filemanager.a( 6755): Failed user authentication for stored login tokens.
I/ActivityManager( 374): START {cmp=com.dropbox.android/.activity.LoginOrNewAcctActivity (has extras) u=0} from pid 6755
D/dalvikvm( 6755): GC_FOR_ALLOC freed 149K, 7% free 7755K/8327K, paused 12ms, total 13ms
D/dalvikvm( 6755): GC_FOR_ALLOC freed 214K, 9% free 7927K/8647K, paused 12ms, total 13ms
I/dalvikvm-heap( 6755): Grow heap (frag case) to 8.582MB for 522696-byte allocation
D/dalvikvm( 6755): GC_CONCURRENT freed <1K, 8% free 8437K/9159K, paused 15ms+1ms, total 32ms
D/dalvikvm( 6755): WAIT_FOR_CONCURRENT_GC blocked 17ms
D/dalvikvm( 6755): GC_FOR_ALLOC freed 34K, 8% free 8447K/9159K, paused 23ms, total 23ms
I/dalvikvm-heap( 6755): Grow heap (frag case) to 9.474MB for 927304-byte allocation
D/dalvikvm( 6755): GC_FOR_ALLOC freed 0K, 8% free 9352K/10119K, paused 22ms, total 22ms
D/AndroidRuntime( 6755): Shutting down VM
W/dalvikvm( 6755): threadid=1: thread exiting with uncaught exception (group=0x40cf1300)
E/dbxyzptlk.h.b( 6755): Outputting exception to log: FATAL
E/dbxyzptlk.h.b( 6755): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dropbox.android/com.dropbox.android.activity.LoginOrNewAcctActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f0d0081 for fragment LoginFragment{414c2630 #1 id=0x7f0d0081}
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread.access$600(ActivityThread.java:130)
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
E/dbxyzptlk.h.b( 6755):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/dbxyzptlk.h.b( 6755):	at android.os.Looper.loop(Looper.java:137)
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread.main(ActivityThread.java:4745)
E/dbxyzptlk.h.b( 6755):	at java.lang.reflect.Method.invokeNative(Native Method)
E/dbxyzptlk.h.b( 6755):	at java.lang.reflect.Method.invoke(Method.java:511)
E/dbxyzptlk.h.b( 6755):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/dbxyzptlk.h.b( 6755):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/dbxyzptlk.h.b( 6755):	at dalvik.system.NativeStart.main(Native Method)
E/dbxyzptlk.h.b( 6755): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f0d0081 for fragment LoginFragment{414c2630 #1 id=0x7f0d0081}
E/dbxyzptlk.h.b( 6755):	at android.support.v4.app.l.a(panda.py:864)
E/dbxyzptlk.h.b( 6755):	at android.support.v4.app.l.a(panda.py:1080)
E/dbxyzptlk.h.b( 6755):	at android.support.v4.app.b.run(panda.py:622)
E/dbxyzptlk.h.b( 6755):	at android.support.v4.app.l.f(panda.py:1416)
E/dbxyzptlk.h.b( 6755):	at android.support.v4.app.FragmentActivity.onStart(panda.py:505)
E/dbxyzptlk.h.b( 6755):	at com.dropbox.android.activity.base.BaseFragmentActivity.onStart(panda.py:21)
E/dbxyzptlk.h.b( 6755):	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
E/dbxyzptlk.h.b( 6755):	at android.app.Activity.performStart(Activity.java:5018)
E/dbxyzptlk.h.b( 6755):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
E/dbxyzptlk.h.b( 6755):	... 11 more
D/dalvikvm( 6755): GC_CONCURRENT freed 127K, 8% free 9406K/10119K, paused 3ms+2ms, total 26ms
E/AndroidRuntime( 6755): FATAL EXCEPTION: main
E/AndroidRuntime( 6755): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dropbox.android/com.dropbox.android.activity.LoginOrNewAcctActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f0d0081 for fragment LoginFragment{414c2630 #1 id=0x7f0d0081}
E/AndroidRuntime( 6755):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
E/AndroidRuntime( 6755):	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
E/AndroidRuntime( 6755):	at android.app.ActivityThread.access$600(ActivityThread.java:130)
E/AndroidRuntime( 6755):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
E/AndroidRuntime( 6755):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 6755):	at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 6755):	at android.app.ActivityThread.main(ActivityThread.java:4745)
E/AndroidRuntime( 6755):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 6755):	at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime( 6755):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/AndroidRuntime( 6755):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 6755):	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 6755): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f0d0081 for fragment LoginFragment{414c2630 #1 id=0x7f0d0081}
E/AndroidRuntime( 6755):	at android.support.v4.app.l.a(panda.py:864)
E/AndroidRuntime( 6755):	at android.support.v4.app.l.a(panda.py:1080)
E/AndroidRuntime( 6755):	at android.support.v4.app.b.run(panda.py:622)
E/AndroidRuntime( 6755):	at android.support.v4.app.l.f(panda.py:1416)
E/AndroidRuntime( 6755):	at android.support.v4.app.FragmentActivity.onStart(panda.py:505)
E/AndroidRuntime( 6755):	at com.dropbox.android.activity.base.BaseFragmentActivity.onStart(panda.py:21)
E/AndroidRuntime( 6755):	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
E/AndroidRuntime( 6755):	at android.app.Activity.performStart(Activity.java:5018)
E/AndroidRuntime( 6755):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
E/AndroidRuntime( 6755):	... 11 more
W/ActivityManager( 374): Force finishing activity com.dropbox.android/.activity.LoginOrNewAcctActivity
W/ActivityManager( 374): Activity pause timeout for ActivityRecord{41803fe8 com.dropbox.android/.activity.LoginOrNewAcctActivity}