I have the same problem, did you get it sorted?
In my case all of my
GAL
popups appear unformatted. It appears to be because it's not requesting a valid css...
http://localhost/vbb/clientscript/vbulletin_css/style00042l/gal_auto_link.css,datepicker.css
I don't think the ,datapicker.css is supposed to be there.