My topic was tagged for this post, but my issue is not a sim owning the business. None of my sims are business owners. Simply none of the Base/Expansion world businesses are staffed, not even customers showing up and walking around. Just my lone sim. Can't get my pet seen, unable to shop anywhere. My issue is NOT a 'business owner' issue. None of the businesses are staffed anymore, period. I even started a new world, just in case the sim my sim married owned a business and I didn't realize it. (He died of laughter.) Nope, that wasn't the issue. Brand new world, no businesses staffed and no customers. Tried other saves, same thing. NOT just a business owner thing, EA. It's the businesses themselves. Hope that helps.
