I just tried 150% scaling on my 4k monitor (I normally always use 100%) and didn't notice any problems with the CbB control toolbar (latest release).  Do you perhaps have some of the High DPI settings enabled under Compatibility?   It could also be something to do with your video card driver and even your mouse I suppose.  Cakewalk reports to Windows that it's unware of high DPI settings.  I think that means you get whatever your video card/Windows can come up with for scaling.  M