After using the font, the IDE is ripe for reinstallation SOLVED!

[Petr]

Maybe it was true before, but I use three different versions of QB64 in parallel, two of which go to D: and one to C:, and the programs are placed on E: or D: as needed. Both IDEs started having the described problem regardless of which logical drive they were on. I excluded all folders related to QB64PE from defender and it's fine. I know it's been written here, but it's never happened to me before.
I'm currently investigating whether the necessary programs will run in Wine under Linux. I will definitely not tolerate this behavior of Windows under any circumstances.