I installed ProSeries 2024 on a new Windows 11 standalone computer and got the same problem...after entering the two-factor authentication code, ProSeries opens to a 2 inch by 3 inch box and freezes.  Can't resize the window, can't click on anything without the computer simply "dinging".  Can't exit the program with the upper right X in the corner.  Only way to close the program is by ending the task through the task manager.  Tried all the things mentioned by everyone in this thread, but to no avail.  “Waiting it out” does nothing either.