Please update to 1.3.109. I found a bug today that I thought I had fixed, but it turned out worse than I thought. I’ve fixed it, and you really should update to this build as I don’t know when I introduced it. I’m certain it goes back at least as far as the .106 build.
The problem had to do with rearranging documents in the document tree. Their order wouldn’t get updated correctly in the project, causing potential conflicts when viewing index cards or outlines.
I’m sorry for the inconvenience.