Thank you for this thread -- I had an identical problem and followed your trail of workarounds.
Last night I was able to solve the problem by following Apple's instructions here: http://support.apple.com/kb/HT1925
Like you, I found that running in Safe Mode was a successful workaround, but I didn't want to do that all the time. Like you, I looked for addins but didn't find any (except the Mozilla ones that probably didn't affect me since I don't run Mozilla).
Two important facts from the instructions above:
- Uninsntall six pieces of software, not just iTunes
- Uninstall them in a specific order
Here's my recap of the instructions:
A. Uninstall six programs
- Quick Time
- Apple Software Update
- Apple Mobile Device Support
- Apple Application Support
B. Use Windows Explorer to validate that all remnants of these programs are actually gone
C. Re-install iTunes. (It doesn't mention re-installing the other 5 products; maybe that happens automatically as a result of the iTunes intall?)
This worked for me. After the install I was immediately able to see (in Windows) movies that I had purchased from iTunes.
I had the same problem. The issue ended up being that I was trying to listen through a headset and it would not play the movie until I switched to playing through the computer speakers. It took hours to figure that out, and I'm still confused by the fix but at least now I can finally watch this season of Breaking Bad....yay.
I'm not sure if this will help but I have been having video playback issues and found this post in my scearhes. I came across another post on another site that talked about settings in Quicktime via the control panel. So I went into the control panel and started looking for something that might be affecting the playback. Your postings about DirectX pointed me in the right direction. This worked for me on my Win Xp PC.
Control Panel, QuickTime, Advanced, Uncheck "Enable Direct3D video acceleration", OK
I hope this works for you. Without this post I would have most likely never found this fix.
Wel it appears I found the solution... I also couldnt play vids on my Itunes.. The thing was that the video I was trying to play was located in Drive (F:) and itunes was installed in Drive(C:) ... So i just moved the Video from drive (F:) to Drive (C:) and Voilaaa! Everything worked ... I guess itunes doesnt accept or wont play videos from anywhere but from where its installed ... In my case in Drive (C:)
Hope this Helps! Good Day all!