I stumbled across this post: https://forum.thelightingcontroller.com ... 6&start=20
Which inspired me to hard-wire my Numark Orbit and I can't make ShowXpress crash! An overflow error was suggested in the other post, and that seems highly plausible here as well.
Now, I want to point out - this is a total deal-breaker. The whole point of the Numark Orbit is its wireless capability.