A recent AVG and Avast antivirus update is preventing DisplayFusion 9.9 from launching on some systems. If you're running into this issue, please update to the latest DisplayFusion 10.0 Beta.
I'm referring to the little line underneath "au" from "auto." They don't appear when using W11 multi-monitor taskbar, so I'm assuming its from DF. I can't find a relevant setting though. It could also be StartAllBack, I'm not sure.
