Ok, i have one site that I have run Views Gallery with great success: www.warnerpowerlifting.com. It is utilizing Views Gallery 6-x - 1.3.
Recently, drupal updater flagged the 6.x-2.0-beta2 as recommended, (the day Drupal.org was down for restructuring - it appears from looking at the site above that updater now shows 6-x-1.3 as the green version) so since drupal was down, I jotted down to pick up the beta the next day when Drupal was back up.
I installed the beta and all related modules the following day and at first Lightbox2 wouldn't function with it. Then I disables JQuery UI 6.x-1.5, JQuery Update 6.x-1.1, Lightbox 2 6.x-1.11, and Views Gallery 6.x-2.0-beta2 and then re-enabled them in that same order and lightbox 2 worked within the gallery for about 24 hours.
I don't expect that you are going to offer a fix as I now realize I am using a non recommended beta, but thought you should be aware of the problem. For referrence purposes, the site I ran the beta on if a subdomain install on a multi site installation. Views Gallery is not enabled on the primary site and Lightbox2 works without fail. Lightbox2 also works consistantly on the subdomain as long as Views Gallery and it's related modules are not installed; however Lightbox2 only works intermittently if Views Gallery and it's associated modules are installed.
There is nothing to indicate the next statement, but I suspect Custom pagers as the problem as I have always had intermittent success with this module across numerous sites and always ended up removing it, but of course that is anecdotal and may just highlight my inability to understand and properly implement that module and have no bearing on this one...
Lastly, and this will probably be moot by the time this report gets noticed, but in case someone is actively following issues today: I intend to uninstall Views Gallery beta as well as features, strongarm, and custom pagers leaving only the required modules for 6-x-1.3 and then install that version. Unfortunately, I had uploaded roughly 200 pics before the beta gallery and lightbox decided they weren't friends. Is there any way to insert them back into the stable views gallery after the downgrade so I don't have to re-upload them all as they *should* still be present in content (just not assigned to a gallery)?
Thanks!