Hi, Ralph -- I'm just touching base to see if you have any further thoughts about fixes for the GUI for JS4 not working on 4K monitors?
http://rayzoon2.com/forum/viewtopic.php?t=7747
Looks like a probable cause has to do with screen resolution being set at something other than 100%. But I can't dial back to that, as everything becomes too small to be usable then.
Sequencing the changes seems to make all of the difference. When I did the Troubleshooting change above, nothing happened, even after reboot, etc.
However -- I reset my Windows display scaling to 100%, rebooted, and the entire JS4 GUI then was visible -- no cut-off. This is in line with what andy_camb reported in the other thread. (Thanks, Andy!)
But it was unusably small, as were any other non-scaling VSTs I brought up. I could then once more re-set Windows scaling to 175% -- with DPI Override set to 168, as you suggested -- and the GUI was not cut off. Still too small, so I increased the JS4 GUI to 200%, it increased the VST window size in Reaper, and it seems to be perfectly functional.
So -- the fix, for me, at least, is to set to Windows' default size display first, then I can successfully make all needed adjustments. These changes still work after removing JS4 from the instrument track, restarting Reaper, and reloading JS4.
I'm going to fool around with this a bit more to make sure there aren't any subtle gotchas that I haven't spotted yet, but I think all is good. And I'll be purchasing tomorrow if so. Happy dance!