Never had that level up problem. When the turn ends and ask you to add points just click on the message, press F6 then press F4 twice so you get a deactivated. Then hit F10 and go to end turn.
Anyway, can I make a request? The food mood is great, but after leveling up my cities I'm now 3000 food in the hole. Any chance of making the food mod 20,000 or even 30,000?
how is unlocking research causing this problem? could you just NOT unlock the research items that make this occur and let them unlock normally?