Support Video recording playback problem

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http://androidforums.com – HiI have had my One X for 2 days now, and I am having an issue with video recordings. When I play them back I get sound but no picture. I have just worked out that the brightness is down to a minimum giving me a black screen, I can just manage to make out the brightness tab at the top right, and if I'm quick enough slide the brightness up.This has to be done on each video individually, when I go out of gallery and back in again they have all gone back to zero brightness. Help! Does anyone know if there is a default setting on the phone anywhere, or any other suggestions to put this right. (General)