Jazz sent me an email explaining this, and I am able to duplicate it.

When you load the probing wizard, you are in effect unloading the screenset. If MDI is active, I can see why it might crash. The simple answer is don't open the wizard with MDI active. Please let Andrew know what you've found, and see if they'll fix it.

I could modify a screenset for you so the MDI is not active on the same tabs as the Probing Wizard, but that would be a pita imo.

I'm a bit surprised that it took 18 months for someone to find this. :)