Quote The Elf:
My main Cubase window is 'stretched' across the two monitors - not maximised. It seems that this may be the reason I'm OK.
Cheers, Elf. Got it. As Tex has said above, the key is not to maximise the Project child window, I think maxing the main Cubase window should actually be fine.
A bit ironic this, as you're most likely to want to max the Project window when you have just the one monitor to play with, and trying to pop anything else up with it causes this issue: if you've got two or three monitors, it's unlikely you'd want to stretch the Project window all the way across them.
Don't know if it's Windows and Cubase or Windows and whatever program that Steinberg use to program and / or compile Cubase.
From my slightly hazy experience in programming this sort of stuff a few years back, it looks like the Steinberg guys are using the correct Mircosoft developed/approved protocol/tools to develop this, they're just using it in the wrong way: There's a chap called Mink (IIRC) on that Steinberg thread that explains it reasonably well.
Anyway, I have a workaround (not to maximise) and I also have a fix: get multiple monitors. Can anyone suggest a supplier of reasonably priced "one above the other" type monitor brackets?