What program/app plays YouTube videos?

Whatever program it is, my copy of it seems to have developed some "glitches" and i'd like to uninstall then re-install it. It refuses to play "mixes" and "playlists" - all it plays is the first one in the sequence - and it won't let me go to "full screen": all that shows is darkness. If i can do the dump then reload thing, it should work ok because it was fine until recently.

Thanks in advance!!!

Update:

I uninstalled Adobe Flash, then downloaded and re-installed the critter. Same problems: can't play playlists or "mixes", and "full screen" doesn't work either (despite full screen working fine for sites other than YouTube). Help?

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