Use task manager to close the program, maybe even do a restart, and open the program again
Hold shift+ctrl+alt while opening the program to reset preferences
Thankyou for your suggestions, John, but unfortunately no success.
I have actually done several restarts + have uninstalled and re-installed twice.
The bizarre thing is that I did two hours of editing last Friday, with NO PROBLEMS!
That night, I installed two programs; Nero Burn lite and Fair Use Wizard. So yesterday I uninstalled both of them and then again tried to re-install PE3 - but still having the exact same problem. The computer is treating it as if it's running (in Task Manager, etc), but I can't see it.
Does anyone else have any suggestions???
I am very reluctant to transfer this file to PE9, because I had previously tried that several weeks ago, and the quality just isn't very good.
Better than uninstalling those two applications you would be better using System Restore point to roll back before you installed the apps. Unfortunately many apps uninstall processes do not remove all the registry entries they may have made.
A couple of obvious things to check are that you have the latest graphics and sound drivers (get them from their manufacturer's web sites), and the latest QuickTime (v7.6.9 at time of writing).
Insanity is hereditary, you get it from your children