I have an LG Optimus L3 (LG E400R), which runs Android 2.33, and have the most current Youtube app. Just today, the videos started to only play the audio without any video (just a black screen). Any suggestions on how to fix it? I have cleared the cache, and uninstalled then re-installed. The phone has been factory reset earlier due to other reasons, but I'm not sure that is relevant to the problem.