Thanks... I've disabled the NVIDIA audio devices in the Device Manager and disabled any audio devices in the system except for the main analog output which is all I'm using. I tried with and without the Realtek driver (crashes either way) and, like I said, I'm running the most up to date WHQL NVIDIA drivers... since this is my workstation, I only installed just the display driver, not all the extra stuff.
I can use the software just fine, it's only when I quit the program that I get the bomb dialog. Perhaps it was just resolve itself over time.
Thanks, SteveG and A.Kubba for chiming in and offering options to try.