I've just loaded a current demo of Boris FX for the latest FCP (7.0.3) Mac (10.6.8) and it being weird. It worked OK for a little while, now it won't open the Boris Library browser anymore. It just stopped working.
Can you guys help? I tried re-loading Boris, but no dice. Is there a Preferences file that I need to trash?
When I first started using boris I ran into the same problem. It turned out I didn't have the cursor in the timeline at the point of the effect. If I moved the cursor then the program window would appear correctly.
This may be what is happening to you.