T-Money
Conquestador
I have found lately that when I have lot of units that I want to uprgrade, such as spears, swords, or warriors, when I activate a unit in one of my cities and press Shift+U, it doesn't upgrade all of my spears/swords/warriors/whatever. It upgrades most of them, but not all. Usually my outlying cities do not get upgraded. And yes, they are connected to the resource, I do have the cash, etc etc.