I'll give that theory a shot
I notice it is a REAL variable- sometimes, I can refresh a page and where signatures were the second before, there's none
I've seen a few folks mention such things ( "why do you think I have that quotes as my signature?" followed by "I can't see it- how do I get it to show up??") and this goes back and forth a few posts then disappears into the forum sediments
It realy does seem like a glitch, but it would make sense to me that there might
be some sort of character/word limit whereby after you roll it, the signature renders... but I SWEAR I've seen proof that this is NOT the case...
EDIT okay maybe it IS post length