Have you updated Twojeffs' Visitor Controller recently? From what I've read at Simbology, the first AL version of the VC caused exactly the problem you described, but it's fixed now.
I will check that out. I probably DO have that first version of it. I was so busy blaming squinge, I didn't go looking for bug reports at Simbology. Grrr....
Yup that was it. Cookies for you.