Update: I’ve opened another project to rework the mix, exported a mixdown for mastering and one of the drum tracks is slighty out of sync with the rest of the tracks. Since it’s a vst drum machine in Kontakt I thought it was a problem of CPU while exporting-which would have been a first-but it does the exact same thing when playing the project with all inserts and sends bypassed. The midi containers are all fine and start where they should, it’s the same thing that happens with my choral section in the other project. i’m giving Cubase a few days to calm down and hopefully fix itself…