First off, my system specs:
CPU: Intel Core i7 2600k CPU @ 3.40 GHz (8 CPUs)
Memory: 12 GB Corsair Vengeance 12288MB RAM
GPU: Nvidia GTX 580 Superclocked SLI (x2)
OS: Windows 7 Ultimate
After Effects CS5.5 Version 10.5, I installed all the recent updates, the footage I was using was from video copilot, I didn't get any error messages when I put the footage in, After Effects just freezes up when I put the footage in. I was using Adobe Bridge in the background to import the clips, but I also tried importing in a different way by just plainly dragging and dropping the clips from the folder, I have not downloaded any third party codecs.
I've tried the troubleshooting, all of the solutions in the link you gave me, but none of them worked, I turned off the firewall. You can see what happens when I import the .mov clips in After Effects in the video link on the very first post of this thread. But suprisingly, the .mov files work in CS4 but not in CS5.5.
After Effects CS4 and CS5 (and later) handle QuickTime files entirely differently, so it's not surprising that there is a difference in behavior.
Do other QuickTime files work OK?
What codec do the problematic files use?
Please answer the other questions on the page that I linked to.
I can view the quicktime files, but I don't know what codec it uses, most likely H.624.
Action Essentials uses the PNG CoDec. If it crashes right away, you might wanan investigate your hardware acceleration settings in the Quicktime control panel. It might also help to switch off your second graphics card in the driver...
Still doesn't work after I switched graphics cards by turning one off and I checked everything in Quicktime control panel, there wasn't really a problem there. Weird thing is that everything worked a fer months ago, just now for some reason everything is crashing...
Well, something has changed for sure. Have you checked your Windows Event Viewer for a more specific cause? Knowing the fault module might help. It could be a mundane graphics driver crash, after all...