Unity 4.6 GUI Problem on Android

Hello everyone,

we are now working on a new GUI Application for both IOS and Android. The problem starts when we run the app on android, within the app we log in to Facebook and press on the phone's buttons(Volume up/down etc..) right after that the textures switch off,if there is some text element it also turns to a dot.

we believe it might be something with the native client or android manifest but we have not found anything on the web.

any ideas???

Have a great day. Tamir.