Unable to play Youtube/TED/ ... videos

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http://androidforums.com – Hi guys! Recently I've been given a HTC Hero! However, I cannot play Youtube videos, TED videos, ... I haven't tried a lot of other stuff cause I think this is a general problem. Whenever I play a video, the loading icon doesn't go away. The previous owner told me he had this problem for not so long, maybe since Youtube changed its layout. He did a reset when he gave the phone to me, but that didn't fix the problem. Do you guys have any idea what I can do? Thanks! (General)