Hi, I've been trying to use sandbox mode in single-player AI skirmish, and it just doesn't seem to work. I've reinstalled PA:Titans before, and the commands listed in keyboard do not work. I check the Sandbox option, start game, and try out the commands. I hover over a unit from a factory (Ant) and CTRL-C, and then CTRL-V somewhere near it. All I get is a "notification" sound from windows that doesn't seem to be tied to a message. If I try Alt-F2 and then CTRL-V somewhere in my revealed map, nothing happens. Same with Alt-F1 for avatar. I'm very confused, please help.
Are you playing yourself, or spectating AI? You have to be controlling a player to determine what army the unit will be. Check the "dev mode" box you can see above and make sure a "C" is selected. You also said "a unit from a factory"; CTRL-C is for units in the world, not build-bar icons. My sandbox mods are also helpful: organizer is the big one, and Improved Player Control and Bulk Create Units can also be useful for heavy duty testing.