youtube wont stream videos...dailymotion and yahoo videos did

[bad881]

bought lumia 620 2 days ago..whenever i open some video on youtube for most of videos(9/10) i get error saying sorry, can't play this file on your phone...even nokia care doesnt know how to fix it...on dailymotion and yahoo videos stream and play smooth but not the case with youtube... thought it to be wifi problem but then it wont work on 3g and 2g too..!!! help guys if someone out is listening... no one seems to have such kind of problem...

 

[Huime]

my advice would be bring it back to care center and insist to flash a new copy of firmware. Either IE or the default player is messed up.