This had once happened with me also.But the problem got solved automatically.Try to reinstall adobe.
A lot of my youtube vids.have recently stopped playing. All I get is a black screen with a static loading circle. however, the same vids play perfectly on my partner's 6 year old Packard Bell XP desktop. I have good broadband speed and the latest Adobe Flash. I know that there are a lot of issues since Google became involved but why does my partner's streaming work and mine,in a lot of cases dosen't