I Can't Change My Signature?

So I've been trying to change my signature for the past couple of weeks. It's outdated- we don't even run Custom-Siri anymore. So I'm trying to change it to a list of my devices. No matter what I put in it, when I try to submit, it says that the IMG tag isn't allowed. I'm not using the IMG tag, I'm fact, I'm using no BBCode at all. Just straight up text. Any reason why?

"image is invalid or not found"

hmm.

I didn't post a picture...

Oh wait. Let me fix that.

Fixed.

are you using a color or font? try simply writing your devices with absolutely no changes to the default text settings.

I did. Just straight text. No fonts, no colors.

ask bgizzle then.

Finally got it to change. Apparently, it doesn't like emails...