Remember my "Flash Trick" option
that I posted above? I did say there that you only have to do it once for the change to take place in all browsers, but it might be a good idea to test that statement and do the same Flash hardware disable in any flash video in IE9, (both versions, 32 bit and 64 bit).
That said, your mention that you have other issues with IE9 points to some other problem, and I am guessing ActiveX or other add-ons.
ActiveX are BHOs, or Browser Helper Objects, peculiar to IE, and sometimes they, or other add-ons, can go bad or be malicious or just poorly coded.
Try this. Open IE in it's "No add-ons" mode. You will find that in Start > All programs > Accessories > System Tools.
This will open IE with all add-ons, toolbars and extensions disabled. Some web sites may not display all content, and I doubt videos will work, but if you don't experience any problems with IE in this mode then this points to an add-on, toolbar or extension being the culprit.
If so, then you can re-open IE normally, head over to "Manage Add-ons", disable them all then add them back in,one at a time, and test until you find the offending one.
See if that helps.
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