Hi rharv,
Thanks for the info on this.
PG Music Support said, "I recorded two octaves of a C major chord, and sharp signs appeared on both Cs and the first F. Just like before, the signs went away when the song was saved and reopened."
I appreciate your handling the beta testing on this. I'll probably be updating to 2018 (assuming they do a Christmas sale again this year) so it would be nice to have this resolved once and for all.
It's not a show-stopper, since saving/reloading fixes the display problem, but it is distracting until you do save/reload.
And as you would suspect, it affects all MIDI overdubbing, too, since as you re-record a section with the MIDI controller, everything new that you created in the overdub has the same sharps/naturals problem, until you save THAT change.
It's like a summertime fly that keeps buzzing the potato salad.