Welcome to the forum.
Can you give us a full description of one of those problematic Projects, please?
What are the specs. of the Source Files (the Assets)? More detail, the better.
What are the settings for the Project?
Exactly where are the Assets, the Scratch Discs, and the Project stored? I saw mention of external HDD's, but it seems that they are not playing any role in the problem Project.
When you have problems creating a New Project, are they identical - the one that works, and the one that hangs?
Good luck, and let us know a bit more please.
I have managed to uninstall and reinstall the software twice, first time the same problems were happening, second time all is now fixed - still unsure why this was happening or what the fix was - there was no difference between the first uninstall/reinstall to the second.
We really can't help you if you don't answer our questions, Martin.
Sorry, not feeling 100% today, what I meant to say was that after the 2nd uninstall/reinstall it is now all working properly again.
I had some small issues with my new desktop.
And if I fired up my complete home network--the problem was reduced.
Immeadiately I figured the new Quad Core cpu was not fully acting on all its cores.
Same with my Core 2 Duo desktop.
If I added more workload--the proccessor's seemed better. Than if in some lame state.
All of that disappeared as the desktops worked and I did OS re-installs.
I would have to guess, your new hardware, is just in need of some things.
We were pleased to learn that your problem was resolved by a just the Premiere Elements uninstall/reinstall
as you wrote in your post 2 and repeated your result in post 4.
As SG pointed out, the details of these issues are important to get at the core of the issues (whys) and expedite
matters to get you moving forward with your projects.
If the problem reoccurs, please get back to SG in this thread with details necessary to help you. In this instance we will not know if the problem was really with the install or rather with corruption of Premiere Elements settings file which could have been handled by deleting the Adobe Premiere Elements Prefs file or the whole folder in which it exists on the hard drive.