Windows 7 Pro x64
AF Photo version: 220.127.116.11
I noticed today that the Inpainting Brush was not "drawing" where the circle is, but rather with an offset to the right. The offset seems to be in absolute value, not in percent of its diameter, so if the brush is small, it will draw completely out of the brush circle.
As an observation, yesterday I was working on the same document, but I don't remember having any issues, except today. I could provide the document by email, if required.
As screenshot didn't capture the cursor, I had to take photos of the screen. Apologies for the quality.
After closing the document and opening it again, the Inpainting Brush worked fine. This makes the issue even more worrying, as it doesn't have consistency, so it might be hard to reproduce.