I have recently updated my Flash Player, though I would also like to argue that these updates are coming out way too frequently, and am now having trouble watching videos such as with YouTube and Blip. These videos would often either stop playing as if waiting for the buffer (but there is still plenty of buffer and more still loading) or abrubtly end (as if it reached the actual end of the video) in the middle of a video. I would need to refresh the page and restart the stream to try to watch the video to completion, and would succeed only if I'm lucky. I originally thought it was specific videos and then a single hosting site, but when the exact same problem was happening between different video services and this was only starting after the last update, I figured it was Flash Player. I wish I could go back the the last one while you work on fixing this problem.
I'm using a Mac with the latest OS and Safari.