FYI:
I starting using two CM15's a few weeks ago.
1) I finally feel good about the reliability of the system and the macros that are running.
2) I decided to plug the first CM15 into Jeff's XTB-IIR at the head-end.
3) I didn't want to run an 80' USB cable from geek room the the head-end for monitoring and mods.
4) I've got macros that require AHP and PC to be running 24/7/365.
So I've split those macros off the original house file and those run in the CM15 local to the PC/AHP.
GMAN, after taking Dan's advice, you might also try using Windows device manager; rescan the USB device tree.
If none of that works, I'd bet on a bad CM15. If you've got another PC (laptop, whatever) plug the suspect CM15
into that as well; even without AHP being installed. See if Windows on that machine detects new hardware; though
it likely will not have the driver, it's a clue that the USB interface on the CM15 is working.
After-post: When I do need to make mods to the head-end CM15, I simply download his file into the local CM15, swap
CM15's out, and dump the local AHP file back into the original...