The wind died down a bit, so I gave the update a shot.

After a bit of a struggle to get the mount to load (USB issues again) I finally got everything connected. The mount's slave, rotator and shutter settings were all zero again. I re-entered them, and saved them to eprom. I tested the dome to slave to various parts of the sky, and it all worked. The shutter didn't disconnect, and the dome rotated appropriately.

When I moved the mount to home (000 az.) the dome slewed to 000, then onto 090, and back to 360. Once it git back to 360, it stopped appropriately. Some reason that "000" sends it 090. Not sure why, since the mount was at 000, it's park ing position is 000, and the dome's home/park position is 264. Nothing is set to 090. But it sopped after that one iteration, so I'm not too bothered by it.

I then turned everything off and tried again, This time I turned on the debug logging.

INDI again failed to connect my mount. I tried rebooted three times, turned off the mount and back on, and it failed to connect.
It is supposed to connecting at USB0 - but it won't. And when I try to SCAN for ports in EKOS - it only shows USB0 as an option.
So I was not able to test the slaving again.

Also - while the slaving and dome rotator motor settings were still saved in the EPROM and loaded up, the SHUTTER settings reset back to ZERO.
I tried saving them several times, and INDI said all was written to EPROM, but when I rebooted and checked, the shutter settings were back to zero.

I didn't have this issue with the ASCOM driver, so its not the shutter firmware.

So he attached debug should show the CEM120 not connecting, and the shutter saving to EPROM several times - but which was either never saved, or the settings are reset back to zero upon loading.