Search function stopped working

Has anyone had this happen: The search function within a project (command F) has stopped working. But the search function on the top right of the toolbar that searches all of Scrivener still works. If I quit the program and reopen, this resets the search function but then it stops working again. Anyone have any ideas? I hope it’s not an indication that this project may be corrupted.
Thanks!

The only thing that comes to mind is if the cursor isn’t blinking in the text editor when you try to use Cmd-F search. That is a document tool only, and so it requires a document to be active with text to function. It will also work in other areas of the interface that have text, such as synopsis and notes, but again you have to click there first to search there. It won’t work in places like the Binder or Keywords list.