Thank you. I will check the guiding camera for orientation. It is good to know that the mount works best at 1 x guide rate, it's not what I have been using but in this case I actually tried both, 0.5 x and 1 x. I will definitely change it permanently to 1 x. The problem happened out of nowhere, last time I imaged everything worked fine and than I spent several weeks without imaging because of the weather and then last night this happened.
I didn't know the orientation of the guide camera mattered, I will definitely double check.
