I believe there has been a related problem with the Atik Horizon whereby that wasn't being recognised in third party software (like SG Pro) as a CMOS camera with variable Gain and as OSC. Resolving that problem has required an Atik ASCOM driver revision that now enquires "which Atik camera" and "colour or mono" and "what gain" rather than having one simple generic CCD (only) driver and I fear that fixing one unique camera problem possibly had a wider knock on effect. However, this has all occured in the space of a few working days, so anybody affected has been a tad unlucky. Most owners won't have been affected if they didn't download the driver with the 'bug' and had stayed with the former.
I believe it has now been fixed and the latest drivers now work fine with SG Pro etc, but there remains a residual issue with Sharpcap (but then an Atik Horizon has never worked properly with Sharpcap). I have spoken to Atik Support today and they are working hard to eliminate any residual problems. But I think all is now good with SG Pro, Maxim etc. I think Atik's software developers have done a great job in correcting this so swiftly, as I gather this 'bug' was wholly unexpected. It even impacted on Dusk.