I am having a similar problem, whenever I insert the shortcode and preview the changes there is nothing at all. Attached is a screenshot of that and here’s the page I’m trying to put the gallery on: http://markbrandoncontracting.com/portfolio/
We are still using the old gallery until we can figure out what the issue with Gmedia is. Though from reading through the forum I have suspicion it may be our theme interfering. I can probably make you an account to take a look at it, but if there is anything I could do myself just let me know.
Thanks
– Lauren