Does it happen the moment you start mIRC or after you do something specific?
Response:
It happens when I open any mIRC windows, Query, channels, custom windows and any other.
If you change the Windows color settings in Windows Settings/Personalization/Colors, does a specific setting there fix/cause the issue?
Response:
I have transparency effect mode active and using Windows Spotlight.
Sometimes this happens when Windows spotlight changes the background of the picture.
![[Linked Image from i.ibb.co]](https://i.ibb.co/jkV47QT7/Screenshot-1.png)