Hello,
The only link in my signature is the one from Sturat, I've tried adding a link to my Twitter profile but it didn't update after clicking update signature. I've tried previewing it and than it worked, but after clicking update again.. nothing.

Than I added the word 'test' to see if it was the URL or not, but once again, my signature stayed like it was before.

Is there any known error or am I doing something wrong?