I think it occurred when I placed or removed a regular inserter.

I believe that's what the devs are currently trying to do.

Sadly I made that picture with Gimp and don't have the motivation to transcribe all the data in another format.

As I was bored yesterday, I spent some time creating a new Technology Tree for the wiki until we get the one in 0.13

https://wiki.factorio.com/images/Technology_Tree.jpg

And I noticed a few oddities. For instance, the Flying tech requires both Advanced Electronics and Electrical Engine . However ...