the current version seems to have a nasty bug, which crashes not only the game but ultimately can destroy the savegame too (the last at least if you are running it on a server like we do) :!: Good thing that there's the autosave feature.
Regarding the bug: I'm/was using the street sign version, which should be indestructible with the default settings. Well, turn's out they aren't indestructible. Yes, you can run into them with a tank and nothing happens, BUT if fire gets just close enough or you deconstruct the note with your right click or you lag into the sign with a vehicle (yes, happened to me-.-) the game crashes. In case of the game running on a server this destroys your current savegame, since the map is saved even with the client and server crashing, resulting in another crash of the server the moment it beginns to load the map for a connecting client. I attached the server log for debugging purposes.
https://forums.factorio.com/viewtopic.php?f=92&t=30980&start=40#p243924