I just realized that my code won't give you the same look if your #overlay is "stuck" at 1.
Go to you plugin folder and open wp-jquery-lightbox then styles. Open lightbox.css and go to line 115 or search the page for #overlay. Check the code, it should be:
Make sure your default is what's above. Then add the code I provided in last post to your custom CSS file. If you have to make a change, make sure you make the same change in lightbox.min.css file.