When I view a commit in Diffusion (e.g., http://phab/rW19908), and when I look at an audit (which appears to be the same view), I get the following error message at the top of the page:
> * ERR-UNSUPPORTED-VCS
All of site's functionality appears to work otherwise.
I believe the problem started within the past week (i.e., due to a git pull I did yesterday, but not present in a git pull I did on 9/28), but I'm not positive.