Android displays black rectangles instead of drawable images after opening openGL context

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http://stackoverflow.com – I am developing a simple Android app that has a few Activities, say: A, B, C, and D. *Activity A* is a splash screen. Calls finish() when same data finishes loading. Activity B displays some information and a few buttons Activity C starts a webview with the content accordingly to the button pressed in B Activity D opens an openGL context. From Activity A I go to Activity B., from B to C and from C to D. Problem I face: some drawables and a progressBar display black rectangles after pressing the back button coming back from Activity D (activity that starts an openGL context). Any ideas where (HowTos)