Glitched Post/Signiture?

[Total-Insanity]

So I have been trying to edit my signiture. I was editing it, adding clickable links ect as you can see below and then when I update it once so the page does not refresh I see everything is fine. I do this once again, look at the  signiture, it's fine. Then I do it once again, I have a look and ALL of the writing is gone. No source, cannot scroll or edit any of the previous post. It's just literally a blank page with every option available to edit the post (like bold, colour, size ect) is faded out as if unclickable. 

This has happened to me before too. I am stuck with two things looking really silly and I don't like it at all.

Am I missing something really basic here? Or is this some kind of glitch?

[Agro]

Hm... that's a strange bug. The extra "[/font]" that was there made the editor flip out. Your current signature should work again now.

I'll have to update the editor soon but there's a bug in the most recent version that I want fixed first. Until then, PM me if it happens again so I can manually fix it.