Q: Is there a way to change the size of the lightbox image when it opens aside from republishing each gallery all over again?
I have about 15 individual galleries on the site and have decided that the images should open up to a larger size. Since I have made some appearance changes it would take awhile to go through and republish them all...

A: VisualLightBox app. generates images with sizes that you specified for "Image resolution" parameter at
Gallery->Properties->Templates
tab. So, if you want to change image resolution, you need to re-generate your gallery with new settings.