I received an error message while powering-up my STX-16803 using MaximDL v6.2 as follows: "Error (6) initializing filter wheel" I had been cycling the camera on and off at about two-minute intervals while I was debugging a separate problem with my electronic focuser, when suddenly my attempt to connect camera and filter wheel failed (see log file attached at line 04:27:39). My setup in Maxim DL is for SBIG AO w/FW. I disconnected the AO and routed the FW7 pigtail directly to the camera to see if that would help (also changed setup to SBIG Universal). No success. Multiple attempts in both camera configurations, still no success. I uninstalled and reinstalled all drivers, including the SBIG Driver-checker itself (v4.05). No luck. Updated the firmware via the SBIG Driver-checker and still no luck. Removed the FW7 from the camera and confirmed there was no obstruction, and was able to spin the filter wheel freely - no binding. The optical sensor was firmly fastened down with the phillips-head screws, etc. I should emphasize that I did not "hot plug" any of the components while cycling the power. I use only the master switch on my power strip to power down. Your expert help will be most appreciated!