Phd2 stopped working

[5teveL]

Does anyone have any idea why all of a sudden PHd2 has decided it doesn't want to guide my Eq6-r?  It worked fine last week, the only changes I made were putting the guide scope up top to help balance, adding a focuser & I rolled APT to its newest edition. PA I assume was spot on as I use sharpcap & unguided it would take 1 min subs @ 670mm with no trailing  (she's heavy @ around 13kg) with phd2 it would trail !
Watching the target in phd2 it seems to drift off one way, usually diagonally.

Thanks

[david_taurus83]

Did you recalibrate after moving the guidescope? 

[5teveL]

1 hour ago, david_taurus83 said:

Did you recalibrate after moving the guidescope? 

No, actually I didnt, & I also rotated the guide camera, didn't realise this made a difference.  

[david_taurus83]

Yes, it makes a difference! PHD was probably trying to correct based on the previous orientation of the camera. Any time you move the guidescope or camera you should do a fresh calibration in PHD.