placed down a blueprint. Tried to deconstruction tool to remove the blue print, got reminded of ctrl+Z undid twice to undo the initial blueprint and game desyned. Not sure what else would of caused it.

No mods are being used either.

desync report

I don't know if this will work for everyone, but it worked for me. I was having a similar problem where the game wouldn't launch and when it did crash it wouldn't generate a log either. The game launches and runs fine in 0.14.23 but doesn't work in 15.x. After having reinstalled the game, deleting ...

Have you tried using the stand-alone install experimental version from their website?
I ended up getting it working using that and disabling my anti-virus.
Still wouldn't work in Steam for me though.

tried that completely fresh install onto a new hard drive from the website and does the exact ...

Windows 10 64bit
i7-3770k
16gb ddr3 ram
SSD
gtx980

Dont have any anti virus even installed. and windows defender is completely disabled.

This is the log. wasnt showing anything when i launch it but found the log file and this is what its saying.

0.001 2017-04-25 10:46:34; Factorio 0.14.23 (build 25374, win64, steam)
0.001 Operating system: Windows 10 (version 1607)
0.001 Program arguments: "L:\SteamLibrary\steamapps\common ...

With the 0.15.x update the game will no longer launch on steam. click play it goes to launching then nothing.

If i revert back to 0.14.x the game launches completely fine.

I have completely reinstalled the game. tried different 15.x versions verified game integrity. restarted my computer ...

okay so long story short was happening for like 30 minutes earlier trying everything to fix it and just kept happening. left it weaiting for replys just jumped on to try and trigger it again and grab save file and its just fixed it self. issue just stopped occuring saves are fine again idk ...

The log files were all in a 5 minute span of eachother every time the game either saved or just after i crashed from a save loaded the map. if we dont save no issues as soon as we save it just crashed. but only on this map. single player or a new map in multiplayer doesnt crash when saving.

So i was able to rejoin the server now post crash. Then went in and manually saved the game and it caused a crash. every time it saves it crashes. Log file.

0.001 2016-08-08 14:35:00; Factorio 0.13.15 (build 23843, win64, steam)
0.001 Operating system: Windows 10
0.001 Program arguments: "D ...

We rolled back the server and i was able to rejoin. but now the game is crashing whenever it autosaves.

0.001 2016-08-08 14:26:09; Factorio 0.13.15 (build 23843, win64, steam)
0.011 Operating system: Windows 10
0.012 Program arguments: "D:\steam\steamapps\common\Factorio\bin\x64\Factorio.exe ...

So was playing and game went to autosave while i was placing landfill. once auto save finished the game crashed. with this error log.

0.001 2016-08-08 14:24:46; Factorio 0.13.15 (build 23843, win64, steam)
0.001 Operating system: Windows 10
0.001 Program arguments: "D:\steam\steamapps\common ...