using Scrivener 2.5 on Mac OS 10.9
And it is the Project Replace. When it didn't work (several times, naturally, trying words that were before me in the document) I used Find, and that worked w/no problem. I didn't have this problem in the last version of Scrivener.

My replace function isn't working either, though find seems a-okay. For what it's worth, it used to work. All boxes checked, says "not found." (I tried various iterations of caps and no caps, still no replace.)

me too. has anyone posted a fix?