Another issue I've noticed is within BO, Catalogue - I can't click past page 2 - it gives me an error and doesn't display the products. I get a 404 directory not found - no matter which page number I click - it does the same when trying to link related productsThis might be due to the URL rewriter. Do a search of the forum here for 'humanfriendly' and see if changing to that resolves this.
I'm assuming you've configured the settings for tabs according to the step by step setup guide:
https://nbstore.codeplex.com/wikipage?title=Step%20by%20step%20guide%20to%20a%20working%20store
Regards
Rob