I've asked support to see if they can replicate what I'm seeing, but wanted to see if anyone here is experiencing the same issue. Nothing came up in my search.
I have an Arturia Keylab Essential 61 keyboard connected to Reaper and find that the PW only affects the pitch in the UP direction on E1, D2, G2, and only in the DOWN direction on D#4.All other notes seem to work as expected. I found this when trying to do a slide from D2 to B1b, and nothing happened. Not sure what's going on with these particular notes, or whether it is my Keyboard or MODO BASS (or Reaper). Can anyone please see if you can replicate?
I also found similar issues with the MW and Vibrato not working on some notes. You might check that too.
Please let me know what you find.