This thread is going places :)
Your problem is this http://cdn.designfather.com/wp-content/themes/open/js/jquery.tools.min.js Name hints file consist of jQuery.tools stuff and it does but oops, also includes jQuery 1.3.2 and then all bets are off. You can see in JS error console that Lightbox Plus think jQuery is 1.3.2 and so its .delegate http://api.jquery.com/delegate/ does not compute as it was added in 1.4.2
Also has some "jquery.event.wheel.js" thing. Besides of course jQuery tools script. That is another jQuery library thing used for tabs etc.
I see theme is from Themeforest so you should be able to contact dev. and ask for a fix? You cant because he removed theme? (I cant find it!) Well, then find another. May be from someone who updates their premium stuff? Idea of bundling is pretty good as an optimizing tweak, less http request, but not for mission critical scripts like this. No need to say jQuery 1.8.3 is ALSO loading. This bundle script is not identified or can act as a genuine jQuery = mess. And besides it is dirt old and probably wont work with lots of newer plugins, Lightbox Plus is one of them.
If you can fiddle with theme code you can fix this with no dev. Brute force is simply to edit out the ancient jQuery. That would be hmm the first 2 lines under
* File generated: Fri Sep 18 05:25:32 EDT 2009
both starting with
Next problem could be jQuery tools as that is also very old. http://jquerytools.org/release-notes/version-1.1.1.html from 2009 so if compatible with jQuery 1.8.3 or not I dont know.
If I am not blind and dev. really has removed theme you cant re-download it so make backup before doing anything. And perhaps start looking for new theme. Since this is crazy outdated other things probably are less than great. Time to die...
Dev is still selling there http://themeforest.net/user/Maximus/portfolio so you can always ask if he can help. Oh, they have own forum and there is one for "Open" theme http://support.themedemo.net/forum/open