I do not know if it is a setting or if anyone else has this issue, when you add item to shopping cart there is a contiue shopping button and checkout button, when you click continue shopping it goes to a page not available or blank page but only in this area of shopping cart no where else
I assume you mean your Drywall Tools site?
I had a quick look, it appears you're using the SEO addon for product and category pages. However, the Continue Shopping button links to the non-SEO version of the URL:
I would guess either your template doesn't have the hook in place for the SEO addon to take effect, or your seo database table is borked. More likely the template is the issue in my opinion…try swapping it out for a minute with another skin.
Is there a way to to get to the yoursite.com/categories.view?category_id=43
and change it in the skins area