HBO GO suddenly freezing on sign-in with Comcast/Xfinity. Other browsers installed will work, but after a system update Firefox no longer does. Any ideas?

After a routine Windows 7 update, Firefox will not load the HBO GO content when you attempt to sign in. Normally, I do not have to sign in unless I log into the account via my Droid or other PC. I tried it in Google Chrome and works fine on my Droid. Also, now when going to full screen option, Flash opens a new window and have lost the options to control the display ratio and toolbars. Any ideas?

It sounds like we've got a number of *different* problems on this thread.  I'll try and respond to a few of them.
@filter 2.5 and everyone else running into a green screen issue.  Please try the solution outlined in the post below to see if it will allow you to use hardware acceleration.  The other alternative is to try a different ATI driver.
http://forums.adobe.com/message/4865912#4865912#4865912#4865912
@pipseer - Somehow Internet Explorer's activex filtering was enabled on your system.  This troubleshooting is also described in this FAQ: ActiveX Filtering in Internet Explorer
@Sahloknir - For the sound issue, we're going to want your system specs.  Please start a new thread with:
Operating   system  
Browser  
Flash   Player version
Dxdiag Report Instructions
Sometimes video and audio problems are caused at a lower level and not directly related to Flash Player.  I recommend trying both of the links below to see how they perform.  If the problem exists with both, then Flash Player is most likely not the culprit as the HTML5 video link does not use Flash Player when playing.  You can verify the use of HTML5 by right clicking the HTML5 video and looking for the words "About HTML5" at the bottom of the context menu.
HTML5   video  
Non-HTML5 video
@mem2013 - The Flash Player update service will not impact Flash Player's performance.  This is a separate service that runs for just an instant on your system once an hour (if you have automatic updates enabled.)  Changing it from manual to automatic shouldn't make any difference.

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