Thank you, Sir. The trainer now opens as it should (though I still had to do the offline authentication); however, it doesn't seem to activate in the game. While at the main screen, pressing "F1" does nothing and pressing the associated keys during game play does nothing. Interestingly, when I quit the game and press "F1", I DO get the message that the "trainer can't find a game" or whatever it says.
Thoughts?
Hmm, well, have you tried the other common 'fixes' like unzipping the trainer into the Steam/Far Cry3 folder, running Steam, the trainer and the game as Administrator? I just tried mine again and it's still working fine.
If those don't do it, I really suggest going thru the TroubleShooting guide in detail. It's very detailed and complete, and located here:
www.cheathappens.com/trainer_troubleshooting.asp
Coupla other games you might like: Tomb Raider and Dishonored.
Hope ya get it sorted out.
[Edited by element5, 5/5/2014 3:57:40 PM]