I solved the problem. I have 3 monitors. I disconnected the one that I got the hung screen on. Now Helicon Remote works great. Hopefully this is a permanent solution.

I have had the same problem with other software (Prusa slicer). I should have tried this fix earlier.

The software worked great for one session. The next session it started acting oddly, now it won't boot up even with no camera attached.
Canon R7
USB
Windows 11
Helicon Remote ver 4.5.3.0
What I've tried:
Uninstall/reinstall with fresh download
cold and warm boots
different camera Canon Rebel T1i