You can also look if your tablet has a package called 'WEB FLV' (Menu->Settings->Applications->Manage Applications). This package is like the 'Youtube Support Package'. When I bought my tablet, it had also video problems but updating/reinstalling that package fixed the problem.Important Note: You will have problems for play videos if the size of video is too big (About 400x320 I think), or if the video use a non-supported codec(H.263 not H.264). That would mean you need to convert the video(s) you want to see.Hope this help. 
