[2021] Out of Sync Multiplayer Error

If there are no mods involved and you have the correct version and checksum, probably best to post the OOS logs in the Bug Reports forum.  

I hear that the next patch 1.3.2 will have a strong MP focus, hopefully that will help with these issues!  

I hear it is in intensive internal testing right now. They rarely announce fixed dates because it depends so strongly on how those tests go.

It is possible it will come out as a public beta first though, not sure about that.