At least two people have encountered a display bug with inline edits. After the editor presses the Submit button, the edit form remains on the editor's screen, and the three-dot "work in progress" icon continues flashing indefinitely. However, the edit does actually get saved in the system, and is visible to other users. This was initially reported in chat:
T: Anyone want to give a go at re-titling [this post]? There are too many questions there for me to come up with something sensible.
P: I attempted to submit "How does rep increase and get displayed? Why should I register, and can I keep earned rep if I do?" but it's not going through.
T: It did go through
P: But the real answer is to tell the user "don't ask multiple questions in one post."
T: Interestingly enough, I also had that problem (where it just hung there).
P: Interesting indeed, I'm still seeing the three-dot "loading" icon thingy and the edit box.
T: Yeah, I think there might be a bit of an issue.
This was marked status-completed yesterday, but the fix is incomplete. I just inline-edited this question one minute ago, and did not see my changes take effect after I hit Save Edits. Unlike before, the edit form did go away, and the three-dot "working" icon did not stay on the screen. A standard page refresh solved the problem.
EDIT 2, 15 seconds after submitting edit 1:
When I submitted edit 1, the new content loaded immediately.