Originally Posted by Alan Mills

please explain further. You mean when youopen the project there are no sequences within it or that no timeline is visible when the project has opened? If the first, then you had a bad project. If the latter then easy, just double click on one of the sequences in the project and the timeline will appear.

The reason why your PPro2 project will no longer in PPro2 is that you saved it while in CS3. It's the only explanaition. Go find your most recent backup from Ppro2. That'll still be ok.