and it seems to me that it can have to do with plugins/licences… I had errors in the past with waves when accidentally opening projects in Nuendo and Cubase at the same time… usually this is not a problem… But had errors… This is stuff which is usually not possible to repro - sometimes “stuff” happens, sometimes all is well… so - as I said - I just avoid it… transfering data / setting using track-archives or save channel settings to file etc…