Specifically, when I type or paste into the search box a word that I know is in the document I am currently editing, the program reports "No documents were found for these search terms." I tried changing the parameters of the search ("Search In This Topic, All Topics," etc) and I tried re-indexing the topic. No luck.
I did an experiment -- I created a new document with only the text "quick brown fox." Then I searched for the string "fox" and again received the message "No documents were found for these search terms."

The search function seems to be able to find results in older documents, but nothing recently edited or created.
Is this a bug, or am I missing something obvious here?
Any help would be appreciated.
Matt