Hi Phil,
Last night I had my Horizon OSC version 5.0.0.4 working with Sequence Generator Pro and SharpCap - but in MONO ONLY, but it refused to connect to Infinity.
There are still some issues with SG Pro/Sharpcap, but that could be just me. However, I see this particular ASCOM driver has 'CCD 'in its title....which probably gives us a hint where the broader issue might lie. The Histograms didn't respond (which was the original problem that I reported with Sharpcap last month). Control wasn't good enough to continue and by the time I got fed up, I was beaten by cloud.
This morning, I reinstalled 4.2.2.9. Now SG Pro won't work, but Infinity does!
Quite clearly the problem is that they require different ASCOM drivers or at least some process to identify CCD or CMOS. The fact that other Atik camera owners are not moaning in the forums perhaps suggests this is strictly a problem for the CMOS Horizon (yet again).
However, I have an idea that may help you. When I reinstalled 4.2.2.9 I did NOT prior uninstall 5.0.0.4. I just allowed 4.2.2.9 to find the incompatible components and close them. Interestingly, the Camera Register features here, perhaps suggesting this is an issue of camera identity/registration.
The other thought is that you must specifically select <install drivers> and <install ASCOM drivers>. The default for these boxes are unchecked in the 4.2.2.9 download wizard and the required drivers won't get installed if unchecked. It is very easy to miss the ASCOM as they are right at the bottom of the list. If in doubt, I suggest just tick everything. My guess is that since mine works and yours doesn't this is probably the issue and your drivers have gone AWOL. But it is clear that people are wise to avoid 5.0.0.4 until this is fixed.