Does anyone use Tpoint?

I have to admit I don't understand everthing about this program. But mapping the sky seems to be a straight foward task. My problem is that after mapping at least 30 stars and everything is landing right in the middle of my ccd chip, I will stop and take some images of something for a while, then I'll go back to The Sky to slew to another object and all the sudden the pointing accuracy is off. I mean way off, its barley in the view finder. I can't seem to figure it out. My scope is permenatley mounted and I've had to do several mapping runs and it always turns out the same, Pausing for half an hour for imageing then it forgets where its at or something. What up wit dat????

By any chance are you imaging with an SCT that does not have its mirror locked down?

Ron W