Not being prompted to place lots
I recently got a few new expansion packs that have lots that should be prompted for me to place (for example, the way Chez Llama comes up to be placed when you get the Dine Out game pack). I was prompted once in one world and was able to place it fine, but because of a separate issue, I had to revert the save file. I then waited to be prompted again in the same world, but after a few hours of gaming, I wasn't asked. I then opened a new world/save file, and still wasn't prompted to place any of them down, including ones I didn't have an issue with beforehand.
You don't always get those prompts with the extra lots that come with some of the packs in every new save depending on how many packs you have. All those prompts really do, imo, is to let you know the lots are there. You can find all of the lots in your library as they are added when the pack is installed. So just take a look in your library and place those that you want to use.
Hope this helps.