"Old database error" followed by an
"Unable to access database error"
Working with PT support I found that with my system I have to do -
START->Programs->postgreSQL 8.2->Stop Service.
A dos window appears, telling me the service is stopped. I can then Start the Service (same way, different choice) and all is well.
For some reason postgreSQL starts on my system at boot. I can think of several reasons to want as few processes as possible at boot. Hi end graphic games comes to mind. The cleaner the boot, the better the performance for those games.
I mentioned this to PT support, suggesting they alter the start up script for PT3 to first stop the SQL service, then start it again. This would nearly always provide a clean known state at start up for postgreSQL.