Consistent application crashes

I use PDF Reader X extensively and consider it the best PDF viewer available for Mac. However, after being updated to 1.8 and 1.9, the app consistently crashes right after being launched. Perhaps it has something to do with the long list of bookmarks I created in version 1.7. I like the idea of Library, but untill the app becomes stable, I need to downgrade to 1.7.

DevNull1 about PDF Reader X - Edit Adobe PDF, v1.9