Hi Bront,
I would assume, as you are, that this is a JS or CSS dependency issue. Are you getting any errors in the browser console window that might help identify which one?

Also, are you loading / listing the dependencies in a related xml file or in the JS code? If from an xml file, I believe you'll want to make sure that the following is included: <dependency path="vis/vis"/>. If from the JS code, try using the LABKEY.requiresVisualization helper as that should pull in all necessary files instead of having to list them out individually.

Thanks,
Cory