Thank you for the info. I have tried the above. This SM 1.5.5 image + restore my backup has always worked. I didn't update the software and out of the blue it started acting weird during guiding, as if it wasn't seeing the guide pulses. Guide history looked line a sine wave pattern.

Jasem has replied to my email very promptly and I have updated to the lasted nightly build from a fresh 1.5.7 image. No restore profile. Created a blank profile and testing the simulators. Seems you have to find something first before guiding calibration will work with the Simulator. It has the same problem of not finishing guide calibration and displaying the message that started this thread.

Clear skies are now a week away... thanks again for taking the time to reply, I appreciate it.

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