I see that the IB crew took my suggesting and started sigs below the message text rather than below the user frame text. The users of evil mobile devices should be rejoicing. But it needs a little tweak yet.
Something (probably the editor) eats trailing whitespace in a message, and the <hr> of the sig is appended immediately. So there is by default no whitespace at all (and afaict no way to put any) between the message and the sig. This makes it very annoying to read.
Please put at least one line of whitespace between the message and <hr> of the sig.