VST-Instruments stop playing when selecting the track in project window

Hello everyone,

I hope you can help me, because I am about on despair…

Since a few days, my VSTs (no matter which, like HALion, Groove Agent, Battery etc.) randomly stop playing when I select the track they are loaded in in the project window. The instruments do show that the MIDI signals of the notes are coming in, but the sound is just not playing any sound.

Once they stopped playing, I cannot get the instrument to work again. I need to re-add it freshly and copy the MIDI data. After a while, the above happens again - as said randomly.

Just to be clear: Nothing is muted etc. The sound was playing right before I selected the track.

Does anyone have an idea what this is about? Thanks so much.

I am using Cubase 12 Pro (Windows)