Sometimes it happens, just out of the blue, that midi doesn't sound.

Before doing the full reset, on my computer here it works that way, I just open "Options"; "MIDI/Audio Driver setup..." and close it again. Usually the sound is back after that.


Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build