If it shows a bunch of lines backspace them all out and delete your sig again.
Click save and go go to home page.
Go back to sig page and try again.
I know it's frustrating.
But we will get it to work.
Hmmm that didn't work..
Did you delete it before you reuploaded it?
Try deleteing it again and click save
If the sig shows up backspace it out and reupload your sig
X out the pop up error box and click save.
Once it is in there, you are gonna get an error pop up message. Your sig may not show but click Save anyways. It should show up.
I made a post about for @Sitting-Duc but he hasn't been online to see it yet.