I just got an adobe update and when I hit the start button the little snapshot fades out a bit and the music and talking starts but nothing else.
I'm not sure I got an update, but all of the videos on the website for me are also now black, but have audio playing.
It was also doing this before and after the flash update installed, for me.
Switch to HTML 5. That worked for me.
I was having this issue on Chrome. After playing around I discovered that enabling the flash PPAPI plug-in I was able to watch videos. Originally I disabled it as it caused flash to run terribly on chrome but apparently the last update made the work around just as bad.
I think we found the problem today but won't know for sure until it gets out to everyone. I was using a hardware acceleration CSS trick which is wildly used to get better performance on CSS transitions. Looks like some windows chrome setups were not loving this. Not sure when the problem started. The fix might go out this weekend but not sure. In either case I am definitely keeping an eye on this. Sorry for the trouble.