I have had several problems with my LG Optimus L3 ( e400g ) .
What I have noticed is that after a while of playing videos in the Youtube application (about 30 or 40 minutes) This freezes and I have to close it from the administrator of native applications.
After that I open the application and load everything correctly, but when you play the video you see the black screen and only plays the audio.
This also happens when trying to play it from the native browser or dolphin browser or any other application on Youtube substitution , only the audio is heard , try to find a solution to this and read it in comments of another user, record a video that the image was fixed only when read by the phone , took the test and if it does, restart it and run it all again , but in other occasions had happened to me on Stock ROMS .
Now I have a rom based Latte v2, and I keep passing the same.
It is quite annoying and it can not be. Do not know if something would serve a logcat , but just leave it.