I just upgraded to PD10 and I'm having some problems. When I edit videos originally done in 9, PD10 crashes a lot. I have hear that 10 and 9 can live together, but when I installed 10 it erased all tracing of 9. I would like to have 9 available to editing 9 version files. What is the best way to get 9 back without cause 10 any problems?