Groove Agent SE4.2.40 unstable?

Last night I produced a track, with 4 instances of Groove Agent SE4.2.40- all sounds well, but this morning there is no sound on the tracks. I have performed the maintenance task in the E-Licenser - that solved problems with Groove Agent I had before - but this now had no effect. The sound is very soft and some midi notes are not played at all. What could I do to fix this? (other than buying a new version).

these are my specs

eLC Version
Groove Agent SE4.2.40
Version 8.0.40 Build 263 (64 bit)
Windows 10

thanks for any tip