I just updated my SBIG drivers (sbiudrv.dll) using SBIGDriverChecker64 and both my STF-8300 camera and ST-i guider are now downloading SUPER SLOW - my other non SBIG cameras are working fine - download speed for my STF-8300 is now running about 33 seconds for an unbinned immage and the ST-i is about 8 seconds. I don't think there is a way to roll the driver back. I hesitate to even ask anyone to try them. Anyone have any suggestion ???