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I haven't played with home businesses much (even with fixes, they're annoying!) but I know that those few sims who've had them were able to invite people over just fine, though before I added mods they would be rude about it if someone left a newspaper on the floor or the dishes started drawing flies. It is, of course, possible that I have a fix for this that I forgot. It happens. Is your game fully patched?
The only way to be sure it's not mod-related is to pull your mods, I'm afraid. It doesn't have to make sense at the macro-level, only at the level at which computers operate. From a human perspective, the code is complex enough that chaos theory applies. Also, some people don't fully document their mods so that when you install one it makes unexpected changes. (Pescado is notorious for this.)
A lot of people have made mods that make businesses function differently, but the only ones I can remember at the moment are Cyjon's Less Complaining and More Customers.
http://cyjon.net/node/42
Ugly is in the heart of the beholder.
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Sim Media Res .
Widespot,
Widespot RFD: The Subhood, and
Land Grant University are all available here. In case you care.)