Hi MrSorensen,
Thank you for using the Apple Support Communities! You have tried great steps so far. We would also recommend testing in another user account. Being able to see if the issue occurs in another user account will help to identify if it is something that is affecting your entire system or just one particular user account. To do this, you'll want to set up a Test User account and then try to replicate the issue in that account by following the steps below. These are from the resource titled Add a user or group on Mac - Apple Support
"Add a user
1) On your Mac, choose Apple menu 
> System Settings, then click Users & Groups 
in the sidebar. (You may need to scroll down.)
2) Click the Add Account button below the list of users on the right (you may be asked to enter your password.)
3) Click the New Account pop-up menu, then choose a type of user.
- Administrator: An administrator can add and manage other users, install apps, and change settings. The new user you create when you first set up your Mac is an administrator. Your Mac can have multiple administrators. You can create new ones, and convert standard users to administrators. Don’t set up automatic login for an administrator. If you do, someone could simply restart your Mac and gain access with administrator privileges. To keep your Mac secure, don’t share administrator names and passwords.
- Standard: Standard users are set up by an administrator. Standard users can install apps and change their own settings, but can’t add other users or change other users’ settings.
- Sharing Only: Sharing-only users can access shared files remotely, but can’t log in to the computer or change settings. To give the user permission to access your shared files or screen, you may need to change options in File Sharing, Screen Sharing, or Remote Management settings. See Set up file sharing and Share the screen of another Mac.
For more information about the options for each type of user, click the Help button in the lower-left corner of the dialog.
4) Enter a full name for the new user. An account name is generated automatically. To use a different account name, enter it now—you can’t change it later.
5) Enter a password for the user, then enter it again to verify. Enter a password hint to help the user remember their password.
6) Click Create User."
Go back up to the Apple menu in the upper left of the computer and select "Log Out". At the login screen, choose the "Test User" just made.
Once inside the Test Account, try to replicate the issue to determine if it just occurs in one account or on the whole computer.
Thank you.
