It'd be nice if there was some space above the top terrain options in the map editor (forest and volcano terrains).
I was going for the volcano, but had apparently moused over the 'Help' option and clicked the drop-down option off of it instead. Then my screen froze like there was a pop up somewhere but I couldn't figure out how to get out of it.
I had unfortunately made a lot of edits that I lost b/c of this.
Learned my lesson, save often!