I upgraded my computer from Windows 10 to Windows 11. Generally speaking, the switchover went smoothly, but there seems to be a problem with the UWP MIDI mode on Cakewalk.
Some MIDI messages are no longer getting through, including "Machine Control" messages. I'm using the VS-700C: I receive all status messages on the VS-700C, but I can't send any to Cakewalk, i.e. one-way communication. However, the control surface is well configured. I can only use MME mode.
With Windows 10 I didn't have this problem.
Perhaps it's Microsoft's rapid abandonment of UWP mode towards "Project Reunion" that's the cause, but obviously for many users it seems that using MIDI UWP mode is problematic.