I just ran another experiment and it does seem to be slewing the wrong direction - in at least one axis. I reset everything again with the scope pointing west (as close as possible anyway). I manually slewed to north and was able to plate solve again and the mount pointing seemed to show around the right location (90 deg DEC && the approximate correct latitude for my location - ~37deg). I then attempted to slew to an object that was higher in the sky than Polaris and to the northwest (effectively higher and more westward than the current location at that time). Instead however it slewed to a location to the northeast. After slewing, the coordinates shown in Ekos seemed right (AZ ~326 deg / ALT 56 deg). However the scope definitely slewed to the east instead of west. The altitude seems like it was probably about right.

Although I do not own a rainbow - my Temma2 experience the same problem messing up the DEC direction during different imaging & platesolving sessions. After some testing, I've found that I have to start the mount by pointing at the eastern side of sky, and platesolve at the eastern hemisphere. After a successful platesolve then slew to the target. The RA/DEC movement will then always correct. If I start platesolving at the western hemisphere, the slew direction of the DEC would be reversed (I can't remember it's always the case or sometimes). It's strange that both KStar and SkySafari shows the mount is slewing in one way, but the mount is actually slewing in an opposite direction - and that would definitely messed up the goto. 

I saw some others having similar problems. Although without good explanation on such behaviour, try always platesolve pointing at the eastern side and see if that resolves the problem.

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