Version 2603131942 Crashes

I made several QSOs with FT2 on March 12, 2026.

Today I started the program and received a notification that there was an update. Version 2603131942.

After the installation, which proceeded like the previous updates, I started the program. But after a few seconds (the logo did not disappear and I did not have time to press OK), the program closed. I wanted to transfer back the previous version 2603120745, but received a message that the program was still running, while I cannot see where the program is supposed to be running.
Via Task Manager, I could see that JT9.exe was active.
Which is very surprising because not a single other digital mode was running, no WSJT-X or JTDX or MSHV.

Technical specifications of the PC
Windows 11 version 25H2 v26200.8037
Action virus McAfee 1.35.148.1

73's de ON6AT Patrick