firewing beat me to the punch. I was waiting to figure everything out before posting back
In short, I had not translated my Products. So when I switched to another language, the Catalog could not find any Products in that language and hence did not display at all. Once I had translated my Products the Catalog worked exactly as expected!
Now I am trying to figure out how to translate Ubercart's various pane's titles/headers. I'm trying to do this through the .po files but it doesn't seem to be working.
firewing suggested I use the Translate Interface, and of course that works. However I would like to contribute my translation back to the community, so I need to do a bit of research on how to submit translations. Pointers appreciated