Solved Problem Watching Youtube Videos on Firefox

[bingefeller]

I have a strange problem regarding Youtube videos.
If I'm watching a video, and I scroll down the screen to see the comments, when I scroll up back the video screen is messed up and in the wrong place.

Hard to explain but I have attached a screen shot.

I have Flash Player 11,3,300,257 installed and the latest Firefox. This only happens in Firefox.

If I click another tab, then return to the youtube tab, the video is in the right place again.

Hopefully someone can help me.
Thanks,

 

[Sardonicus]

Is hardware acceleration enabled?
Tools > Options > Advanced > General > Browsing

If not, enable it.

 

[bingefeller]

It was enabled but I've also enabled it in Flash Player. Seems to be OK now, but we will see how it goes. Thanks.

 

[Gornot]

I uninstalled Firefox yet again because of these issues (even though was just testing a new stable build). After the last Flash update, it ran in two separate processes as well as the Firefox Plugin process. Result? Flash crashes after no more than 3-4 videos. lawl

Didn't have hardware acceleration enabled in FF, though, cause it constantly causes my system to crash due to my old GPU problems.
IE9, of course, works just fine.