Did you close it “incorrectly” once? Or did everything just start working?
It is of course possible that they have now published an update to fix the core issue! But it is also entirely possible that closing the simulator incorrectly once fixes things for any future simulator starts!
Today when I logged into the sim I had to re-login to Navigraph via the EFB. I shut down the sim twice, once with ALT-F4 and the other by clicking upper right X. When I got back into the sim I did not have to re-enter my login credentials for Navigraph.
To be clear, your G-3000 Simbrief button is NOT requiring you to log in after an Alt-F4. How about without an Alt-F4? My EFB Simbrief Dispatch is now working every time, but the G-3000 button is not.