Hi, I am using Maxim DL 6 with the SBIG STT-8300 camera and 8-position filter wheel with internal guide camera. BTW, I love the camera and Maxim ... except occasionally something is beyond my understanding. Everything has been working fine until last night. I am operating through a POTH hub, with the guider settings control via "ASCOM Direct" and set to POTH hub. I encountered a problem last night that I haven't seen before. When I attempted to activate my guide camera, maintaining all the same settings that I have been using, I get the message "Error Initializing Autoguider / Could not initialize guider output. Please check guider settings". I did check the settings and they have not been changed from what I normally use. I was able to take guider exposures, but could not calibrate or track. I would appreciate any advice as to what might be causing this problem. Hopefully it is something simple that I have overlooked. Thank you. BobH.