[Oppo Find 5] anders3408:
just tried same app. Not sure if it is working in 4.3 roms yet, but log looks like app issue:

I/ActivityManager( 546): Start proc com.kaitenmail.adsupported for activity com.kaitenmail.adsupported/.activity.Accounts: pid=16262 uid=10083 gids={50083, 3003, 1015, 1028}
V/WindowManager( 546): mLidState=1 mLidOpenRotation=-1 mDockMode=0 mAllowAllRotations=0
D/AndroidRuntime(16262): Shutting down VM
W/dalvikvm(16262): threadid=1: thread exiting with uncaught exception (group=0x421a5fd0)
E/AndroidRuntime(16262): FATAL EXCEPTION: main
E/AndroidRuntime(16262): java.lang.RuntimeException: Unable to create application com.kaitenmail.adsupported.K9: java.lang.SecurityException: Failed to seed OpenSSL PRNG
E/AndroidRuntime(16262):	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4602)
E/AndroidRuntime(16262):	at android.app.ActivityThread.access$1300(ActivityThread.java:152)
E/AndroidRuntime(16262):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1328)
E/AndroidRuntime(16262):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(16262):	at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(16262):	at android.app.ActivityThread.main(ActivityThread.java:5258)
E/AndroidRuntime(16262):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(16262):	at java.lang.reflect.Method.invoke(Method.java:517)
E/AndroidRuntime(16262):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:767)
E/AndroidRuntime(16262):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:583)
E/AndroidRuntime(16262):	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(16262): Caused by: java.lang.SecurityException: Failed to seed OpenSSL PRNG
E/AndroidRuntime(16262):	at com.kaitenmail.adsupported.PRNGFixes.applyOpenSSLFix(PRNGFixes.java:86)
E/AndroidRuntime(16262):	at com.kaitenmail.adsupported.PRNGFixes.apply(PRNGFixes.java:52)
E/AndroidRuntime(16262):	at com.kaitenmail.adsupported.K9.onCreate(K9.java:574)
E/AndroidRuntime(16262):	at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
E/AndroidRuntime(16262):	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4599)
E/AndroidRuntime(16262):	... 10 more
E/AndroidRuntime(16262): Caused by: java.lang.ClassNotFoundException: org.apache.harmony.xnet.provider.jsse.NativeCrypto
E/AndroidRuntime(16262):	at java.lang.Class.classForName(Native Method)
E/AndroidRuntime(16262):	at java.lang.Class.forName(Class.java:234)
E/AndroidRuntime(16262):	at java.lang.Class.forName(Class.java:199)
E/AndroidRuntime(16262):	at com.kaitenmail.adsupported.PRNGFixes.applyOpenSSLFix(PRNGFixes.java:71)
E/AndroidRuntime(16262):	... 14 more
E/AndroidRuntime(16262): Caused by: java.lang.NoClassDefFoundError: org/apache/harmony/xnet/provider/jsse/NativeCrypto
E/AndroidRuntime(16262):	... 18 more
E/AndroidRuntime(16262): Caused by: java.lang.ClassNotFoundException: Didn't find class "org.apache.harmony.xnet.provider.jsse.NativeCrypto" on path: DexPathList[[zip file "/data/app/com.kaitenmail.adsupported-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.kaitenmail.adsupported-1, /vendor/lib, /system/lib]]
E/AndroidRuntime(16262):	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
E/AndroidRuntime(16262):	at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
E/AndroidRuntime(16262):	at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
E/AndroidRuntime(16262):	... 18 more
W/ActivityManager( 546): Force finishing activity com.kaitenmail.adsupported/.activity.Accounts