Well, I just tried ZWO's new drivers for their USB2 version of the ASI120MM and ASI120MC and I confirmed that the split frame issue is still NOT fixed. Thus, I now have two ASI120 cameras that will NOT work reliably under anything but Windows 7 (that mean no luck under Windows 8 or Windows Home).
Note, I've had this problem on FOUR different PCs running various releases of Windows 8.1 and Windows 10. In my experience, these cameras haven't work correctly on an Asus Core i3 running Windows 8.1, an Acer Core i3 running Windows 10 Home, an Intel Compute Stick running Windows 10, and a Minix mini PC running Windows 10 Home. The only system on which they seem to work night-after-night is an Acer netbook running Windows 7.
If you are using these cameras for planetary work then you may get some functionality, since these split frames only happen intermittently and sometimes the camera will recover on its own. However, when guiding with PhD these intermittent split frames will make the guide star jump half way across the frame which will cause the guiding to fail (lost guide star). Interestingly enough, these slit frames seem to happen about every 20 minutes of runtime, although I have had nights when the camera seems to work fine (for several hours).
It might be a hardware issue (but then why does it work under Windows 7?), but I actually think it is nothing other than a defective driver.
But, as they say YMMV and some users seem happy with these cameras. Note, this is NOT an April Fools' joke (if only).
Edited by james7ca, 02 April 2017 - 04:24 AM.