Loewchen wrote:So it's working now?

Yes, it is working now.

I saved out a dump file using Task Manager while the error message was displayed, in case that gives any pointers as to what might have caused this problem. I was able to run Factorio after I tried rebooting my laptop (I forgot that it usually goes to sleep / wakes up rather than restarting Windows ...

I downloaded the game through Steam, and verified integrity of the files. It tells me to check saves, mods, logs, etc., but I don't have any of that. I can't find a log file anywhere. Based on the page about the log file, I should be looking in C:\Program Files (x86)\Steam\steamapps\common\Factorio ...