It’s strange we had the same problem with the same symtoms at the same time. In the end I fixed my problem by removing and re-installing Flash… of course on Fedora 64 this is like pulling teeth but it did the trick.
Like you I could still view other Flash sites like YouTube so it was a bit of a long shot. Still could be worth a try for you as well.
p.s. I should add I tried the wrapped 32 bit version and the 64 bit alpha, I think in the end I settled on the 64-bit alpa (RC2) but it’s worth trying both.