When clicking on the "Edit" link on any post, the resulting URL returns 404.
I've noticed it on SuperUser (trying to edit my question) but it also happens on this very site as well, so it looks like it's a network-wide issue.
My user-agent was set to Linux
(that is, the plain string "Linux") and it looks like that was causing the problem (ironically, I had to do this to test a site that would behave differently based on user-agent, and it looks like I found a bug here as well!)
I'd like to know why the user-agent has any incidence on whether editing is allowed (especially given that it allowed me to login and post a new question just fine) and would like to see this fixed, even though I do agree it's a low priority issue.
Regards.