Hi Brett,
Glad you're liking PhotoSmash!
It looks like the Custom Layout gallery_viewer is missing some of the HTML. There should be an extra div or two in there:
'
<div class='bwbps_galviewer'>
<div class='bwbps_galviewer_head'>
'
These appear to be missing. From your source code. If you go to Smashly.net/about/ and view source on that page, you can see what the source should look like for a gallery viewer.
If you find think that the code for the layout may be the problem, you could delete that layout then deactivate and reactivate the plugin to get it to reload the original code. You can view the layout in Layout Editor...you have to have advanced menus turned on in PhotoSmash Settings / Advanced before that menu option displays.
Let me know if that doesn't get you there.
Cheers,
Byron