All of my issues seem to revolve around the new seating system...
-Some tables and chairs won't register as dining spots. Actually, I've only successfully used the ones that came with this pack and the picnic tables. I couldn't figure out why everyone was sitting outside when there were like 20 tables inside. lol.
-Sims won't sit at the bar. I'm not sure if they are supposed to, but apparently seats at a bar/island don't count as dining spots either, even if I use the Dine Out barstools.
-Linking tables to booths/booths to tables only works 50% of the time. I can't seem to link two booths to a table, like one normally would. It just refuses to work.
-Musical chairs. Still. We already knew that. :p
That's all I've noticed so far, but I've only been actually playing a restaurant for about 15 sim hours.