I have also had the same problem with the Street Gallery in three different saves since this week's (Nov 7) patch. I have not yet tried it in a new save as I thought I'd check to see if it had been reported first. I currently have no mods or cc (I had MCC but removed it before applying the Nov 7 patch and have not added it back). I have cleared cache (do it almost every time before I open the game) and repaired my game after both patches and after installing Cats and Dogs (so three repairs). I have only tried at 200% and 300% mark up, and haven't gotten around to trying the table since I wasn't having any luck with the gallery. I'm on Windows 10 and have all the packs. Also, I tend to do Street Sales as opposed to Yard Sales. I've held them in different locations (outside the Art Gallery in San Myshuno, by the museum in Willow Creek and outside two residential lots in Willow Creek and Newcrest). Sims come and interact, but no one has bought anything since the patch.
Thanks and regards,
Jennifer