Just noticed this today: Posted a new thread to IMHO. Clicked the “Show Signature” box. Everything worked fine, but hmm, what happened to my sig? Oh well, maybe I didn’t check the right box. A moment later, realized I left something out of my OP, so I post another message to the same thread. Was smart this time and hit preview (after also checking “show signature”). Shows up just fine in the preview. When I hit ‘submit post’, and (eventually) get taken to the now-posted post, my signature has now disappeared.
Glitch in programming? Fates out to get me? Something else?