Folder snapshots - nothing happens

I have a folder in my Manuscript section labeled “current draft”, which has the documents that will make up my draft. I used to be able to take snapshots of that entire folder, but now when I try to, nothing happens. There’s no crash or anything, it’s just nothing. I hear the shutter sound effect, but no new snapshot appears in the list. I can take snapshots of the individual documents, and that works fine. But I can’t snapshot the overall folder like I used to be able to.

I’m running Windows 7 Professional w/SP1 and Scrivener