We're having some strange problems with our global signatures, and I don't understand what's going on. I've performed the following :

We already had a global signature, that was working correctly.
Created a new global signature, saved it and set it as default.
GWIA has restarted.
Sent email to an external domain. No global signature is shown.
Checked GW Admin console, and the new signature I created is no longer there AT ALL. The old signature is still there, but it is no longer default.

Anybody any idea where I went wrong? I did insert an image into the signature, but it was only a 6k GIF.

We're on Groupwise 14.2.2, on OES2015. Internet agent is on a different domain to the users.