Dont know what to tell you guys, I have the same problem off and on... even the error for installing flash when it happens.
All i can say is keep screwing around with it. For me, when it happens, I just end the process of procaster in task manager, then restart it and hope it works. It usually does after the first or second time. If not, I restart and its fine until it happens again. It seems like lately, Stopping a livestreaming of Killing Floor on Steam has been when its acting up the most.
If no one is replying to our cries for help, then they're basically looking at our message and going: "Huh... Well. Sucks to be them! *clicks off thread*"