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Thanks, solution 1) works great.

I woul like to have a workspace (eg. the last active or a default or named one) automatically opened at startup. Does anybody know if this is possible? I didn't find a switch or setting for that.

I've got the same problem with a focusrite saffire pro 14 audio device and a keyboard for playing a vst piano. The workaround for me seems to be a setup like seamus and blocking the realtime midi messages wíth midi ox. there were no ghosts playing the piano since then.