Thanks for the feedback. This is the first we've heard that there have been issues under OS X.

Our lonely shop Mac is (sadly) still running OS 10.4. I'll see what we can do to solve this problem.

As I recall, there were some changes made to Apple's USB stack between 10.2 and 10.3 which completely broke compatibility with our keyboards and button boxes. I suspect something similar has happened in this case as well.

Just to confirm, the boxes work reliably under Mac OS builds previous to 10.5?