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As such, I advise you to first clear your "Cookies", "History"
and "Temporary Internet Files", thus making your computer
"fresh" in YouTube's eyes. My infamous "CHTIF" triple-cure
has resolved hundreds of YouTubers' problems. So why not
yours. Be sure to shutdown/reboot after doing this:
Internet Explorer 7:
? Tools ? Internet Options ? Delete...
? Delete files ? Yes
? Delete cookies ? OK
? Delete history ? OK
? Close (browsing history window)
? OK
Internet Explorer 8:
? Tools ? Delete Browsing History
[. ] Preserve Favorites (leave blank)
[x] Temporary Internet files
[x] Cookies
[x] History
? Delete
Mozilla Firefox 3:
? Tools ? Clear Private Data
[x] Browsing History
[x] Download History
[x] Saved Form and Search History
[x] Cache
[x] Cookies
? Clear Private Data Now
Mozilla Firefox 3.5/3.6:
? Tools ? Clear Recent History
Time range to clear: ? Everything
? Details
[x] Browsing & Download History
[x] Saved Form and Search History
[x] Cookies
[x] Cache
? Clear Now
http://answers.yahoo.com/question/index?qid=20100324215208AA0KJ6i