Pilou and Michael,

Thanks for replying. That's weird because it works fine in v4, but not in v5 on the same machine with everything set up the same except which version I launch. I just tried it again and get the same result. The only thing I've changed in moi.ini is to disable script caching.

One thing that might be strange about my setup is that I'm using a graphics tablet, so mouse buttons are emulated by buttons on the pen which are assignable to mouse buttons, keystrokes, etc. with the tablet software. But, I'm not making any changes to this setup when I switch from v4 to v5.

Any suggestions for how I should troubleshoot this?