Logic Express 8 glitches with Mountain Lion - will I lose stuff if I re-install?

I use Logic Express 8, but it has been acting up since I upgraded my iMac from Leopard through Snow Leopard to Mountain Lion. The sliders for navigating around my song projects are not working properly, which makes it difficult to zoom in on details. The program also crashes every time I use Flex-Time. Anyone know why this is and what I should do? I have a large amount of stored music projects on my Mac and, although they're backed up on Time Machine, I'm afraid that if I re-installed Logic Express 8 I might lose all this material and have nightmares getting it back.