<Nexus>
Traveler of the Multiverse
Jó napot Morva úr!1056 (but this was the case in previous versions as well)
Revolutions ignore Max Unit Per Tile rules.
I play with 3 MUPT. City revolts. Spawns ~10 extremely strong units onto a single tile and attacks my city. I kill 3-5-6 with my strongest units being garrisoned in the city, but due to 3v7 or 3v10 scenarios, I ALWAYS LOSE MY BLOODY CITIES TO REVOLUTIONS then alt+f4.

I want to add what Ipex said above that MUPT is not meant/recommended to be used with such low values. IIRC 15 is said to be the lowest safe value.
You may experience infinite AI turns if the value is too low and the AI fails at finding its way to move units.