My question I had problems submitting is here:
The submit button gave me an opaque error when I had this line in my question:
mailto:<uri-encoded local part>@<domain part>
It doesn't matter what sort of code tag I stuck it in, I still got an error.
Preferably I'd at least get some indication of what the error was, and ideally I could submit this and any escaping that needed to happen would happen on the server side.
The error I am getting looks like this:
This happens both on initial submit and on subsequent edits (as the screenshot shows).
Interestingly enough, it doesn't happen on meta, as I just submitted this bug report with no problems!