Hello,
After updating my RPI4 to SM 1.6.0, intermittently, I am getting a "DISABLED: FOV must be 10 arcmins or wider. 60+arcminutes is recommended." in Polar Alignment Tab.
My FOV is more than adequate.
A reboot usually clears that issue.
Other people reported this for SM 1.6.0. 
This never happened with earlier versions of SM.

Another issue - the guider sometimes times-out, the guiding needs to be stopped/restarted.
Again, I never had this with earlier versions of SM.

I am attaching two log files.
-- shorter one. Right after "DISABLED: FOV must be 10 arcmins..." (reboot).
-- longer one. Guider timeout at 22:27:46.763.

Thanks!