Thanks for posting this. I created an account and a support ticket to confirm I'm seeing the same behavior on the latest (7523) version of eyetv and a late 2014 Mac mini on Mac OS X 10.13.2.
It's getting harder and harder for me to continue using this software but I have two Elgato/Geniatech tuners (and a HD Homerun which is now out of the picture). I've already had to move to another application to watch TV full screen but still like eyetv for iOS and DVR viewing. If things don't improve by the time my TV Guide subscription runs out next June, I'll abandon the hardware and move away from eyetv completely.