With aTB display connected, remote performance was good. I disconnected the Tb display and tried the Apple Remote Desktop but that too also left me with the screen not refreshing. I'll try the quartz method to see if that works.
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I assume that you are doing this on the Mini?
Yes, this is on a Mini. But I have to take back my early report of success. I do experience intermittent black screens. The longer it has been since my last session the more likely it is to occur. I did not experience this earlier because I was using the Mini so often during setup and configuration of the software and services I needed.
Even if there is an improvement, the quartz method is a hassle anyway because you have to activate it each time after logout/login or reboot, although that could probably be automated.
I do have another idea but I haven't had the time to try it yet. The hardware dongle method is just spoofing an EDID for a monitor that doesn't exist, and this is reported to work just as well as having a monitor hooked up. The thing is, there's also
a software method for forcing an EDID when no EDID is detectable, and since that is free, I'm going to give it a try some day.