Hello again Menno, I'm embarrassed to say after testing everything in my 4k resolution (and my screen set not to 125% larger) everything works :-)... Something bizarre happens to the resolution which I believe may not be the fault of your software, but the screen resolution, when I set it to the full 3440 x 1440 and "Scale and layout" at 100% it all works fine. So I have to say, I'm sorry about putting your team through this testing, when it was in fact my error, but your mention of the 4k screen, has helped me figure this one out, so now I'm happy to say I can work all in Studio One 5 Pro and not have to switch between Cakewalk to use COS and then bounce it all back to Studio One 5... Happy days and thank you again :-)

Thank you for that Menno, very interesting find, I just swapped my old 27" LCD in and it works in Studio One 5 now... I wonder, would changing the resolution on the 4k screen, make it work? Also, I've found that it works in Cakewalk DAW (the free DAW) on the 4k monitor no problem at all, but in Studio One 5 that's the problem. I do appreciate you letting me know about this bug in the coding platform and very much look forward to when it's fixed so I can start using my new 4k monitor again, (it's a bit of a shock to the system going back to the old LCD display) :-)