Hi Joseph, This ChimeraX error on Mac is caused by a bug in the Qt window toolkit which appeared with macOS 26. The current ChimeraX daily build uses a newer Qt version (6.10) which appears to fix the problem. The daily build is quite stable, so you may want to use it. It is on the ChimeraX download page. Thanks for the info about Report Bug not working once you hit this error. It must work for some people because this ChimeraX error has been reported dozens of times. Tom

On Apr 21, 2026, at 8:15 PM, Beckman, Joseph S <joe.beckman@oregonstate.edu> wrote:

I wanted to report a reoccurring problem I have been having for the past two months.

While the program is sitting open and unused, this message popped up and I have to close the program from the kill panel (opt-Escape)



I have tried to use Report Bug, but the pop up window does not allow me to edit anything. The machine and software ID show in the window are correct.

Thanks for all the support you provide, I learn a lot from the posts but am just an amateur.