Snapshots won't roll back

In my current writing project, I created a snapshot after I finished the first draft. Just now, when I tried to roll back to that snapshot, nothing happened. I click the snapshot in the list, hit “roll back,” and the window pops up asking if I want to create a new snapshot before rolling back – I make my selection and … nothing happens.

This is my first time using this feature – have I missed a step? Or is Scrivener just misbehaving?

Snapshots are specific to each document in the binder. In the screenshot, you have a folder loaded in the editor in Scrivenings mode, showing all its subdocuments, but the inspector is only going to show the information for the document that has the focus–where the insertion point is. It looks like the snapshots are for the folder text (what’s showing in in the top of the editor above the first dashed line, beginning “Mel Girard Takes the Heat”), so when you roll back you’re just going to be changing the text in that specific document. If that text hasn’t changed between the current version and the snapshot you’re rolling back to, you won’t see a difference.

Taking a snapshot only affects the selected document, so if you select a folder and take a snapshot, you’re only taking a snapshot of the folder text, not of all the folder’s subitems. To do that, select all the contents of the folder (you can hold the Alt key while toggling the expand/collapse arrow on the folder in the binder to expand it and all its subcontainers, then Shift-click to select everything) and use Documents > Snapshots > Take Snapshots of Selected Documents. Rolling back needs to be done per-document, via the inspector, though you can certainly do it in Scrivenings mode; you’ll just need to first click into the document text that you want to see the snapshots for and then roll back that item.