[FP 11.4 & FF 14.0.1] Firefox hang on every page with flash-content

Hi at all
I have a problem with the new Flash Player, let me explain it:
We have a windows-domain with software distribution via GPO.
Since update to 11.4 via the msi package (11.3 was previously installed) we have in the meanwhile 3 PCs (all Win7 x32 with FF 14.0.1 and Flash 11.4) with this problem:
- While loading a page with Flash content, the Firefox simply freezes and have to be killed together with plugin-container in order to work again.
If this happens, ff and plugin-container have 0% cpu-usage. It freezes and does nothing...
If I remove Flash: Web-pages are working, but without flash.
What I've tried:
reinstall using flash-uninstaller
Using "normal" end-user web-installer
Uninstall via Uninstaller and tried 11.3 again
reinstall Firefox, both 14 and 13
Nothing helped to bring Flash-support back.
This happens only on FF, Internet Explorer is working fine...
Can someone give me a hint?

Chris Campbell wrote:
The key here will be to determine what is different between the machines that work and those that hang. Of all the systems that fail, they are all Windows 7 32bit?
Yep, this issue only happens on Windows 7 32-bit machines, currently 6.
Do you have any 32bit systems that don't fail?
Yep, the most Windows 7 32-bit machines wont fail.
What about hardware, are there similarities here? Attached devices/drivers? Software that is running at the time?
These machines are all from DELL. They all have normal hardware, nothing special. Other machines from same type does not affected. Software: All have standard software distributed via Software-distribution (GPO). Only some PCs have special software, but it is not running. No special drives, too.
Maybe try booting Windows in safe mode to see if it still hangs?
Good idea, indeed - I will try this.
We're definitely interested in what's going on. I'll ask our security and Mozilla folks to see if they have additional clues.
Thanks!
EDIT:
Safe mode: Flash is working! (without disabled Protected Mode!)
I've set msconfig now to: Custom system start and deselected the boxes to load systemservices and system start elements.
So, now windows does a non-safe mode boot but no service or element was loaded except the drivers (right?). Flash is not working with this config!
So, whats the difference between safe mode and normal boot with minimal configuration (see attached picture).
Only drivers will be loaded, right? If so, I can exclude the network and graphics driver as source: graphics driver are updated right now and network was working in safe-mode.
Any new ideas?
Informations about safe-mode

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Chris Campbell wrote:
The key here will be to determine what is different between the machines that work and those that hang. Of all the systems that fail, they are all Windows 7 32bit?
Yep, this issue only happens on Windows 7 32-bit machines, currently 6.
Do you have any 32bit systems that don't fail?
Yep, the most Windows 7 32-bit machines wont fail.
What about hardware, are there similarities here? Attached devices/drivers? Software that is running at the time?
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Maybe try booting Windows in safe mode to see if it still hangs?
Good idea, indeed - I will try this.
We're definitely interested in what's going on. I'll ask our security and Mozilla folks to see if they have additional clues.
Thanks!
EDIT:
Safe mode: Flash is working! (without disabled Protected Mode!)
I've set msconfig now to: Custom system start and deselected the boxes to load systemservices and system start elements.
So, now windows does a non-safe mode boot but no service or element was loaded except the drivers (right?). Flash is not working with this config!
So, whats the difference between safe mode and normal boot with minimal configuration (see attached picture).
Only drivers will be loaded, right? If so, I can exclude the network and graphics driver as source: graphics driver are updated right now and network was working in safe-mode.
Any new ideas?
Informations about safe-mode

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firefox is stumbling when pages with PDF content come up. how can i get my old version3.5.6 back?

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Restarting my pc usually brings it back to normal until next time.
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[http://www.spywarewarrior.com/index.php] 
[http://forum.aumha.org/] 
[http://www.spywareinfoforum.com/] 
[http://bleepingcomputer.com]

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* see [[plugin crash reports]]
* [[what is plugin-container]]
* [[firefox crashes]]
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* [[http://portableapps.com/apps/internet/firefox_portable/localization#legacy36]]

[FP 11.4 & FF 14.0.1] Firefox hang on every page with flash-content

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