Hi! I've used PSP 8, 9, 10, X1, and X2. I, too, had trouble when I first downloaded X2 with it having trouble co-existing with X1; however, Corel has released and update to X2 (version 12.01) and that seems to have fixed that problem. I really like X2 and going from version 9 to X2, you'll see a whole bunch of new features, particularly those used for photo editing. Take a look at this link (it shows you the different features available in each version of PSP)
http://www.corel.com/img/content/pro...on_5568-07.pdf
Daphne