I noticed that the number of passengers boarding on GSX was different from usual.
In Simbrief, there were 20 people, but nearly 100 people boarded.
The GSX function itself was working correctly, but I remembered that I had reinstalled GSX due to a sound problem, and realized that I had not entered my Simbrief username into GSX. But in the end, even if I entered my Simbrief username, it was not reflected.
The details of the problem are below.
I also took a video.
1) I opened the GSX settings screen, entered my Simbrief username, and clicked the Apply button.
2) The GSX settings screen closed even though I had not yet clicked the OK button, and MSFS also became unable to accept any keyboard input (ESC key, etc.).
3) I waited 10 minutes and still could not do anything, so I forced MSFS to close and restarted it.
4) I started MSFS, boarded the aircraft, and then opened the GSX settings screen to check, and none of the settings changes I had made were reflected.
5) I opened the GSX settings screen, entered my Simbrief username and pressed the Apply button, but I was unable to operate MSFS either. (I couldn't enter any keys, but TrackIR was working.)
6) I waited 20 minutes, but still couldn't operate MSFS, so I used ALT+TAB to switch to the desktop and then back to MSFS.
7) I was able to operate MSFS and GSX worked, but all the settings I'd made were back to default.

I uninstalled GSX.
9) I reinstalled MSFS.
10) I reinstalled GSX.
I tested it, but the symptoms didn't change.
However, the GSX functions themselves are working properly, so the settings just aren't being reflected.
Please tell me what to do.
<Notes>
- The following folders have been set as exclusions in the antivirus software.
- Antivirus software was stopped when testing
- Windows 10 64bit (Japanese)
- Memory: 64GB
- SSD: 1TB free
Thank you.