I often work on different copies of files with the same name, e.g.
2011/allaccounts
2012/allaccounts

In the recent files menu, these show as:
allaccounts
allaccounts

And there's nowhere in the interface that I've found that shows the full path, so I don't know which is which. I pretty much avoid using the recent files menu to avoid making mistakes -- but gnucash also reopens the last-viewed file, which also could be any of them.

I could keep my filenames more distinct (but then what's the point of having folders?), but that doesn't help in cases where I'm looking at backup copies or something.