Hmmmm, thanks to both. I am pretty technical and am familiar with video driver settings, etc.
All I can tell you is I can start, use and exit PS CS6 and start it again, and it will start on the right monitor.
If I do the same with PS CC, it always starts on the main monitor.
So "something" has changed, at lease with how it behaves with Windows 7 64 bit and my Nvidia video card and driver.
I mean I can recreate that with this combination, it behaves differently. Every time...
Needless to say this is very annoying!
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