There's a quick update today to address a couple of small issues. If you lost your progress with the last update then this patch will bring everything back. If not, please send me the log! ([email protected])
After some extensive help from our Linux players, the recent Linux instability has been nailed down to a conflict between Unity 5's multithreaded renderer and some old libraries that the Steam client ships with. We've reverted to the old renderer in this Linux build which *might* fix the issue; if not you can opt in to the beta Steam client or switch to the snowleopard branch until the client is updated.