renoise has stopped playing multiple vsti keys simultaneously

Hi, does anyone know why renoise has stopped playing multiple keys simultaneouslyusing vst instruments?
Even after rebooting the problem persists… I’m using 2.8 with windows 10 for months and everything went ok…
I haven’t installed anything new…

You mean you can’t play chords ?

Maybe you accidentally pressed the mono button in the instr.editor , but then again these settings aren’t saved when renoise is reloaded .

dunno