Images won't load in gallery after WP update

My boss recently updated one of or clients word press sites and everything was fine except now only the first image on each of the gallery pages will load. The images are posted correctly because prior to the update they worked fine. I have no idea how to fix it, but I’m supposed to figure it out.

Here is an example:
http://www.mitchellwade.com/portfolio/blondes/

Here is the code being used on the gallery page:
[portfolio cat=15 column=4 link=image max=8]

Any help or ideas would be so so appreciated. Thank you!