Hello, newtapple.
• If rebooting your Mac doesn’t fix things, see if the problem still happens in Safe mode (hold the shift key down at startup). It can take much longer to safe boot (10 min) so be patient.
How to use safe mode on your Mac - Apple Support
Safe mode forces the OS to clear certain caches and logs and do other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's normal.
Does the problem persist while in Safe mode?
Exit safe mode by restarting your Mac normally and re-evaluate the issue again.
• If a safe boot doesn't seem to resolve the problem, you should run an EtreCheck evaluation of your Mac. EtreCheck is a diagnostic app that gathers and reports important information about your Macintosh. It is very highly regarded and meant to be used with Apple Support Communities to help others help you troubleshoot and resolve your Mac problems.
Please navigate to EtreCheck.com and download the free version of EtreCheck. Once you’ve run the app and created your report please post it with your reply to this message.
You must upload the full report. For instructions on how to attach your EtreCheck report to your reply, please click How to use Add Text when posting…
We can use the EtreCheck report to look for the more obvious things that may be causing your problem and advise how to correct them.