Hi there, @Kooritzky.

Currently, similar cases have been reported about QuickBooks freezing when selecting employees. Our product team is fully aware of this issue, and are continuously working on getting this resolved as soon as possible.

In the meantime, I recommend performing the workaround they provided. Export the employee list via IIF, then re-import it back to prevent QuickBooks from freezing. 

Please make sure to sign in to your company file as Admin and switch to Single-user Mode before following the steps below. 

To export IIFs: 

1. From the File menu, select Utilities.
2. Choose Export, then select Export IIF Files.
3. From the Save in drop-down, select the location you want to save the file. 
4. Enter a name in the File name field and hit Save.
5. Click OK.

Here's how to import IIFs:

1. Make a backup of your company file. This way you can restore it if the data doesn't import the way you expected.
2. Go to the File menu and select Utilities.
3. Click Import.
4. Select Import IIF Files.
5. Browse to your IIF file and select it to Open.
6. Select OK to confirm your data was imported.

You may also refer to the following article for the detailed steps, as well as to make changes to your file and a link for the improved import IIF Tool for QuickBooks 2019: Export, import, and edit IIF files.

Additionally, some customers shared resolution from this thread that performing a mini repair fixed this unexpected behavior. This tool is used to address issues caused by damaged data. 

Here's how to download and run it on the program:

1. Close QuickBooks first.
2. Then, download the Refresher tool and save the file on your desktop.
3. Now, run the QBRefresher tool and re-open QuickBooks.

Also, I recommend contacting our Customer Support so we can add you to the list of affected users. This is one way for us to communicate with you about the progress of the investigation.

You can take note of INV-24741 as your reference number for the current investigation.

If you've got other questions in mind about QuickBooks, feel free to leave a reply below. I'll be glad to assist you in the future.