Thanks again. Sure, I tried all the conventional stuff (except trying another keyboard; that's next). My Delete keys always work everywhere else, so I have to conclude it's some obscure coding problem in Presonus Notion, one of my music notation programs, and only on their Windows version not Mac. I just thought I would see here if anyone had heard of such a problem.


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Presonus Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.