A final note:
Disconnecting the trackball from the keyboard usb solved not only the utility software problem, but also the gun configuration... it went off without a hitch. Now I just need to set up the second gun and adjust for Mame, other emulators, and PC games.
However, in reading through this forum to solve this issue, I discovered some limitations of my XArcade stick. Luckily I have a PS/2 port on my mobo, but I'm eyeing that I-Pac. Also, now I want to install 2 spinners. I think I may be standing dangerously close to the rabbit hole.
Thanks, everyone, for your kind help here!
And thanks also to everyone contributing to this board, not only for all the build instruction, but also for sharing some really cool projects. I think this is going to become a regular place to visit.