OK I've got a zip here with everything fixed up.
Things to know:
--The problem reported by afterburner is fixed.
--The problem with the signature being cleared upon submitting modifyprofile is fixed.
--The default is now to show the user's current signature on the modifyprofile page, with a link to the signature editor. You can change this link to the button provided by VirtueTech if you want to.
--To upgrade, copy and paste the contents of the _editsignature.txt file into your _editsignature template, and make the required changes to member.php and the modifyprofile template. If you have already edited the modifyprofile template I highly suggest you replace those changes with the ones in the install.txt file in the zip.
--It has been fully tested with v2.0.3.
This is my modification to VT's hack, which is a mod to a hack by Fryzid, which is a rewrite of AA's v1.x hack. Got that?
[edit] I fixed the bug afterburner reported...only this time I *actually* fixed it. See the new zip file
here. [/edit]