I have the same problem too although I don't have any hack for the windows. It might be the apt door hack instead, I'm not sure really. It's kind of annoying but I can stand it as long as when it comes back to normal when I play that particular neigbour again.

Comicalmuse, I've tried that fix many times already. It just doesn't change anything.

ancienthighway, Yes, I did. The Cornerstone and Crossroad Apartments come with both stove and frige, I don't have to buy them myself.

In fact, I just found out if you activate the build mode to cut down just one tile's length of the main wall (not the walls that make partition of living room and dinningroom or bedrooms inside the apartment) and rebuild it in these two apartments, you'll find yourself can only juggle bottles when you click the frige.

Well, I know this bug can not be fixed yet. So, let us just wait and see....BUT funnily, this dosen't happen in Tech Center Flats.

My problem in my selfmade apartment is, even my sims' cooking bars are full they can only have or serve instant meal or cereal all day long.

The problem in the community apartments (The Crossroad Apartments) is more ridiculous. After I activated the build/buy mode cheats to rebuild some walls, my sims can only juggle bottles or take out the leftovers.  

I have disabled the custom contents before loading a neighbourhood.

You can find these in MTS2. They are old but still working.

Wellcome back!

I really don't know why? My sims's cooking bars are full but are unable to make more than one dish for dinner in the apartments I made myself. This also happens when I buy a new frige in all the existing ingame apartments. I do hope you can resolve this problem for all the simmers before Maxis releases a patch for this EP8 in a few months time. Thank you!

Yes.  Enter an apartment, whether it's occupied or not, then go to the Option Mode and type out the following cheats.

boolprop aptbaselotspecifictoolsdisabled  false
boolprop aptsublotspecifictoolsdisabled  false  ( I never use capital letters)

Then go to the buymode first and buildmode to see if the cheats are being activated. This is the way I do it. You may have to enter the cheats several times to make them work.