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Ok, we figured it out. He had NVidia Geforce Experience installed that seemed to be interfering with the interface and preventing any mouse clicks from being registered. After uninstalling GeForce Experience, CMBN is working normally. THanks for the help.

I'm doing a second license install of CMBN on my son's PC (Win 10). It has installed and activated successfully, but at the main menu (Battle/QUick Battle/Campaign...) clicking on any choice does nothing. I can also only end the game through task manager--> end process. We had repeated the install with Win Defender disabled, but same result. Any thoughts?

The running driver is 21.10.1

CM is now working on my fresh Win 10 install. I'll update with the Radeon driver that it's running.

Reinstalling CMBN from a fresh downloaded install file didn't help. Next up is a fresh Windows 10 install on spare HDD.

Thanks for the suggestions, but no improvement yet. I've tried drivers 22.2.2 and 21.8.2 with no effect. I've also plugged in headphones instead of my ususal USB speakers, and disable the sound driver. The demo continues to run properly.

I've had CMBN running on my Win 10 (RX 570 GPU) machine for over a year. Today it hanged while loading a saved game, and briefly flashed an error box as it crashed to desktop. I think I caught something about running out of GPU memory. Since that time, I've been unable to get CMBN to start. I can watch the process appear on task manager and increase to about 3.7GB memory usage before the process is terminated. No splash screen ever appears. Restarting the machine didn't help, nor did uninstall/reinstall CMBN. Interestingly, the CMBN demo will load and play without any problems. Any thoughts about what to try?