Videos won't run in FireFox 12

[ChuckR]

I have Windows 7 Professional 64bit. I have IE 9 32 and 64 bit. I have Firefox 12. I used to be able to run a number of the bowling videos on Youtube in either browser. Now I get a black screen in Firefox. What is the problem in FireFox?
Where can I find offline cache and cookies that may need to be cleaned up. I have my settings to clear everything when FireFox closes.
I have Add-Ons
Adobe Acrobat 10.1.3.23
Java Deployment Toolkit 6.0.310.5
Java Platform SE 6 U 31 6.0.310.5
Media Player 1.0.0.8
ShockWave Flash 11.2.202.235
Shockwave for Director 11.6.5.635
Silverlight Plugin 5.1.10411.0
Live Photo Gallery 15.4.3538.513
Extensions
Adblock Plus 2.0.3
DoNotTrack Plus 2.1.0.327
NoScript 2.4.1
WebOfTrust 20120515

 

[zebrax2]

Check your noscript whitelist if youtube and ytimg is added

 

[ChuckR]

Check your noscript whitelist if youtube and ytimg is added

Youtube.com and ytimg.com are in the whitelist. Is that sufficient or should there be more to their URL's?

 

[pyonir]

Does the play button still show up? Did you click it? Sometimes if there is an ad before the video, I'll have to click the play button otherwise it just sits there, because of adblock plus.

 

[ChuckR]

There is no PLAY button, just a black screen. I tried testing by putting the following DISABLED.

Live Photo Gallery 15.4.3538.513
Extensions
Adblock Plus 2.0.3
DoNotTrack Plus 2.1.0.327
NoScript 2.4.1
WebOfTrust 20120515

These had no effect. I am going to try and Disable the following Plug-Ins one at a time.
Adobe Acrobat 10.1.3.23
Java Deployment Toolkit 6.0.310.5
Java Platform SE 6 U 31 6.0.310.5
Media Player 1.0.0.8
ShockWave Flash 11.2.202.235
Silverlight Plugin 5.1.10411.0

 

[ChuckR]

The craziest solution. I disabled the Shockwave Flash Plugin and it worked. I only did this as a last resort as it says Flash and Flash is what I need. I am now working, but I have no idea what the reason for the solution working is.

 

[pyonir]

Might be a good idea to completely remove Flash and reinstall. I have the same version you do, and don't have the issue on Youtube.

 

[cheez]

The craziest solution. I disabled the Shockwave Flash Plugin and it worked. I only did this as a last resort as it says Flash and Flash is what I need. I am now working, but I have no idea what the reason for the solution working is.

You beat me to it. I was going to suggest try uninstalling (or disable) Shockwave Flash and install Adobe Flash Player as it has always known to work well with Youtube...

Though it is unexpected that Shockwave kept you from playing youtube videos.

 

[ChuckR]

Thanks to all.
I hope HTML5 will solve this Flash and other video format problems. SOON