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Updated Firefox AND Flash, and now flash won't play anymore

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So, back in the last version of Firefox, Flash v11.3 wouldn't load correctly. The official solution was to roll it back, install a previous version, and I guess that's alright, but I was really hoping it was a temporary solution.

So now Firefox has updated to version 15. I thought this would solve the problem, and according to the old entries about Flash not working, it has. But then I updated flash, and now it's 11.4, and after updating twice I'm right back where I'm started.

Maybe this hasn't been articulated well enough? The problem isn't that it's a specific version that doesn't work and I'm willing to keep all my plugins in eternal limbo, it's that it doesn't work period. So, I guess I'm just supposed to roll back again? What should it be this time? Flash or Firefox? Does it matter? Which one hates the other one more? Will there ever be an actual solution to this, or will I just have to have outdated versions of one or the other forever?

And also, this is curious, according to this thing below that automatically reads your plugins and what not, I not only have 11.4, but also still have Flash 10.3 installed somehow. Maybe that will make it easier to roll back, but... does that make a difference? Is there anyone with Firefox 15 and Flash 11.4 that doesn't have this problem? I'm kinda hesitant to delete 10.3 because I might... you know, need it.

So, back in the last version of Firefox, Flash v11.3 wouldn't load correctly. The official solution was to roll it back, install a previous version, and I guess that's alright, but I was really hoping it was a temporary solution. So now Firefox has updated to version 15. I thought this would solve the problem, and according to the old entries about Flash not working, it has. But then I updated flash, and now it's 11.4, and after updating twice I'm right back where I'm started. Maybe this hasn't been articulated well enough? The problem isn't that it's a specific version that doesn't work and I'm willing to keep all my plugins in eternal limbo, it's that it doesn't work period. So, I guess I'm just supposed to roll back again? What should it be this time? Flash or Firefox? Does it matter? Which one hates the other one more? Will there ever be an actual solution to this, or will I just have to have outdated versions of one or the other forever? And also, this is curious, according to this thing below that automatically reads your plugins and what not, I not only have 11.4, but also still have Flash 10.3 installed somehow. Maybe that will make it easier to roll back, but... does that make a difference? Is there anyone with Firefox 15 and Flash 11.4 that doesn't have this problem? I'm kinda hesitant to delete 10.3 because I might... you know, need it.

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Shockwave Flash 11.4 r402
Shockwave Flash 10.3 r183

Having both versions installed is probably a big part of your problem.

Uninstall Flash completely.
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Then install the version that you found to be least problematic for you, which sounds like v 10.3.

Personally I have stayed with Flash 10.3, which is still getting security updates from Oracle / Adobe. Then again, I am using WinXP - not Vista. I have had no problems with Flash 10.3, like the problems I have seen posted here with 11.3 and 11.4.

YMMV.

Keep in mind that IE uses its own version of Flash - ActiveX is what it is called in the Add / Remove Programs in the Windows Control panel. That version won't affect Firefox in any manner. The version numbers don't need to be the same for both the ActiveX version of Flash and the Plugin version which Firefox (and most other browsers) use.