Include Archicad version, platform, computer type in your signature. Makes it easier to troubleshoot.
A general tip:If you have a Logitech mouse on a Mac, de-install the Logitech drivers. They suck.
The system drivers will work fine in Leopard. If you're on Tiger, I recommend USBOverdrive (Google for it).
Other than this, I have no idea.
AC4.1-AC26SWE; MacOS13.5.1; MP5,1+MBP16,1