As you know if you use the WYSIWYG post editor, we’ve restricted changing the post message size of text for years. A change was made extending this so that text in other areas is kept at one size everywhere for consistency. Please remove the size tags from your signature. If you post links here to any messages that contain font size tags in the body of a message, a moderator can remove them for you.
Thanks for your understanding with this change. Sorry for any inconvenience this has caused.