Well if your on 503 lets see this is definately cookies and license number
L1234567 THIS IS HIGHLY SUSPICIOUS. I DOUBT THATS YOUR VB
LICENSE CHECK AT THE TOP OF YOUR CONFIG AND CORRECT.
Also view your photopost settings table through your database viewer(phpmyadmin) and settings 171-173 are the cookie settings. Make sure to correct as necessary to match VB
most common culprit people forget to set the cookie prefix which in vb
by default is bb