I suspect the problem is caused by Win10 and its latest update. WSJT-Xv2.2.2 and Thetis v2.8.11 were working until the update.
Now WSJT-X sees Thetis audio, but won't connect to the CAT system. CAT is setup correctly. WSJT-X tells me "Rig failure - Hamlib error: Protocol error while getting current VFO frequency".
Before I reinstall and reconfigure everything, is there something easier to do?