This bug was created simply by moving around the layouts, when I was trying to organize them all. I'm not sure of anything specific that caused it to happen.
Edit: This may be an error on my Windows. I've reinstalled Construct2 and tried it again, with the same results. It happens on brand new projects as well as old ones. My version of [r103.2] doesn't have this issue.
Can anyone else give this a try on r104 to see if they have the same issues?