well we have no control over the lightbox code in any manner. You can try editing these variables in the lighbox.js
file add your gallery name in front with a slash or use full url
var fileLoadingImage = "/images/loading.gif";
var fileBottomNavCloseImage = "/images/closelabel.gif";
As far as logging in have you changed your integration to vb3 yet in photopost and done all those steps?