Parse with Facebook login - Possibly since APK v42 or Graph API v2.4

Each Android iteration comes with its own WebView implementation, for better or worse. 5.0+ Androids use the app-based implementation, which gets regular updates and so on, but also is different than the previous implementations.

Long story short, I believe this my be the problem. The WebView could be maintaining the session for your login or keeping the credentials in cookie storage for repeated use/confirmation. I can not offer a direct solution here as I am not that familiar with the new WebView's insides, but try force clearing the session and/or the cookie storage before each new login and see what happens.

I can see this in your logcat

08-12 19:48:53.371  32227-32227/com.guile.occ E/ActivityThread﹕ Failed to find provider info for com.facebook.katana.provider.PlatformProvider08-12 19:48:53.371  32227-32227/com.guile.occ E/ActivityThread﹕ Failed to find provider info for com.facebook.wakizashi.provider.

Which means its unable to conenct internet check this Android : Failed to find provider info for com.facebook.wakizashi.provider.PlatformProvider

And try adding this in manifest

<uses-permission android:name="android.permission.SET_DEBUG_APP"/>