Just bought AVISIO, too, and my plans are using the Nextgen Gallery, too.
Nextgen Gallery is the best gallery plugin ever for Wordpress, huge settings, great flexibility ... and if you see in the settings for the lightbox effect, there are some more than "lightbox", perhaps you should try these - I haven't it yet, I just begin working with AVISIO.
In my other themes I had good experiences with "wp-prettyphoto" - and in themes, where PrettyPhoto does not work, I had implemented not the Wordpress plugin, but manually the code of:
and then this manual code worked, where the plugin for exact this failed!!
See this manual code working here (not AVISIO - yet!):
And so, where Wordpress plugins does not work, it is sometimes good, just to put the code in the source code of the website, see my site above.