Katie,
I've installed VW10 on 3 different machines all running OS10.1.5. I rebuilt the desktop multiple times, zapped the pram, and ran Norton to de-frag the drives. Nothing has helped. Yesterday, I installed O10.1.5 and VW10 on a partition without OS9. VW launches and opens blank docs with no problem, but as soon as I try to open a v9 doc, the program instantly quits. It never gets to the dialog box to convert from v9 to v10.
I can only think of one other possible conflict. 3rd party software in the OS. I have Logitech trackball software, windowshadeX, ASM, and Fruit Menu installed on all machines. These all add to the preferences pane. Have you heard of any 3rd party conflicts with VW10?