Yes, I think it was that kind of situation. I accidentally removed the power plug and had to restart Fates… that’s, I guess, when the midi input did not work anymore. I restarted again and also repeated the midi device assignment serveral times. Finally it worked again but - as far as I remember - not for all tracks.
Somehow weird and nothing I could report on in a systematic way. I will check again and report back.
By the way: I also like the Fourtunes interface very much! And yes, as I have a grid, grid support would be ace!