One big thing with any of the "trail" version, is that they do not support anything MPEG. This does not seem to be an issue with your "test" Project though, as the trial of CS3 will open it.
Now, while it is always best for one to finish a Project in the version, in which it was created, CS3 Projects should Open, or Import into CS4, provided that there are no 3rd party plug-ins, etc., coming into play. With pure trials of CS3 & CS4, you seem to have ruled this out.
It appears that you are using Open for the CS3 Project. What happens if you instead Import that CS3 Project into a CS4 Project?
I'm running the trial version, updated to version 4.1.0
You can update the trial? Strange.
You can update the trial? Strange.
Wow, I skipped right over that. Maybe Adobe is trying to make up for the Mac having less Functional Content and Effects, than the PC version?
The import was successful in getting the project assets into the workspace and it no longer hangs. Thanks!
However, All of the subclips are pointing to the original subclip. I'm in a different location and can't check the Windows version (CS3) to see if this was caused by the import or not. Let me explain further. The 4 minute movie is made up of 20 subclips. Each subclip is in a subdirectory of the project titled "scene_1, scene_2, scene_3, etc." Each subclip starts with 010001.png and goes through 010317.png, even though 010001.png - 010317.png is different for each subclip. When I imported, and it asked me the location of 010001.png, it only asked me once, and I told it was in scene_1. Now all of the scenes are scene_1 in the timeline. For instance, scene_9 on the timeline has the contents of scene_1.
I was hesitating posting the above because this is probably my novice ability with PPro. I'm not sure why all of the clips got imported as duplicates of scene_1 and I can't find a way to change each clip to point to the proper subdirectory.
But it does appear that importing the project instead of opening it does fix the problem of the infinite spinning wheel.
Also, I could not update to 4.1.0 via the help menu item as it was greyed out, but I did download the 4.1.0 patch directly from the updates section of the Adobe website and it applied the patch without a hitch. They should let people demo with patches because if I ran into a bug during a demo that could have been prevented by a patch, and the patch was not allowed to be applied, well, that's just a bad marketing decision. I'm already limited to 30 days, what's with the non-allowance of patches? No worries on my part as I was able to patch it and make sure that it works.
If anyone can help me with the clips issue I state above, I'd love it, but otherwise I guess I can consider this answered.
When you are moving Projects between machines, the folder structure from the first machine needs to match perfectly on the second, and when I say "perfectly" I mean that. I handle this by keeping all Assets and the Project files on separate external HDD's, but each external has the exact same drive letter assignment on all of my machines.
Now, when one does not have the Assets available in the exact same places for the second machine, a dialog box should open, asking the user to Find these Assets and link to them.
Is that what you are experiencing?
Glad that Importing the Project got you going. Now, if we can just get all the Assets located correctly, you should be good to go. If I missed what you're doing, regarding the Assets, just let us know the exact details. You are almost THERE.