Inf's signature isn't moving because I never fixed ACAMS BBC tags after the forum update. ACAMS created the new ones so in order to restore them, I need to dig through the backup for them (something I haven't done yet because nobody asked me to do so).
Noodle is not the reason for your signature not working. He was only able to break the bot exchange because it wasn't doing any sort of name validation/hashing. The version of your browser shouldn't matter either because all the heavy lifting is done by the server and all your browser needs to do is send the text.
Am I right in assuming that no one else is having difficulties editing their signature?