Glad to see Insim is alive and kicking!

I think it should be expected that you should remove hacks and backup your game (just in case) before you add a new EP. Because you do not know if a hack is compatible with the EP. You should bookmark and check that site frequently for updates. If you're still unsure, ask the mod creator.

Any other problems in the game should be addressed in a patch from EA (if they make one).

Not exactly a bug, but I noticed on one of the Twikki lots, the male and female restroom doors are on the wrong rooms (male door on female restroom and vice versa).