Would like to comment that I have encountered this bug myself, same crash, different trigger. In my case, I triggered the bug by going to Edit→Current Profile…→Colors, and unchecking the box that says "Use colors from system scheme". The good news is that it managed to save the intended settings to gconf anyway and it wasn't a horrible situation, though I did have child processes running in the terminal at the time. Oh, well. :)
Would like to comment that I have encountered this bug myself, same crash, different trigger. In my case, I triggered the bug by going to Edit→Current Profile…→Colors, and unchecking the box that says "Use colors from system scheme". The good news is that it managed to save the intended settings to gconf anyway and it wasn't a horrible situation, though I did have child processes running in the terminal at the time. Oh, well. :)
Hopefully this one is squashed soon.