This may be a Windows 11 issue. When running VarAC 6.0.8 on my machine with a Radeon 6600 graphics card, I get screen flickering. The screen will go black for a few seconds. When it comes back on, the VarAC windows is pure black. If I click the title bar and move it around, everything is then displayed correctly.
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Irad, I think the problem actually lies with the VARA modem. I had the modem running with nothing else running just now, and I still got the issue.