spotlight not finding things in Dropbox folder, "reindexing" not working
I'm using 10.10.1 on a MacBook Air.
For the last several weeks (or more?), Spotlight has not returned results for documents in my Dropbox folder, which is where I keep my research notes. I tried following the "reindexing" directions, choosing the "privacy" tab in Spotlight preferences, adding Dropbox, and then deleting, but this made no difference. I can only locate specific notes now by opening and searching the individual files.
What should I do?
iPhone 4S, iOS 7.1.2, Also Macbook Air 10.10.1