I've uninstalled the Flash version I had on my PC & gone to the Flash site & downloaded the latest version the company has available. Videos are now running. So I'm guessing the particular Flash download I installed earlier was buggy.
Flash video and audio are not in sync. The video refresh is slow in full screen or not. It doesn’t happen on all web sites. Web sites using JW player seem to be most susceptible to these playback problems.
I have the similar problems on two different PCs. My 3rd PC is a little Netbook with XP SP3 and has NEVER been updated and works just fine. It is running Flash 10.3.183.7.
My Dell XP laptop was running the latest Flash. It is a bit old, but has never had a video issue.
My Win7 Ultimate (I5, 3.2 Ghz, 8gig ram) was running the latest Flash and was having the very same issues.
The two PCs above are running FF 14.0.1.
I tried the many resolutions to this problem discussed here and none worked.
I cannot and don’t use IE, because I have to install the latest Flash for it to work.
I was successful by going back to Flash 10.3.183.7 like on my little Netbook. I had to use Torrent to get the old Flash, because Adobe doesn’t provide/support it anymore.
The older Flash instantly corrected the Win7 PC and the XP laptop – for a while. The Win7 PC is still running fine, but the XP laptop has reverted back to slow video performance.
I’ve run virus scans with no issues.
I suspect this growing and common problem is related directly to FF 14.