Known Bugs (Apocalypse)
Firing Infatuated Agents
This happens if you have more than twenty combat agents at (assigned to?) one base. Only the first twenty agents are visible in the hire/fire interface. The others can be fired, just not from the agent interface.
Firing biochemist #1 fires agent #21 as well. Firing biochemist #2 fires agent #22 as well.
And so on.
Whether it is possible to fire infatuated biochemists, quantum physicists, or engineers has not been verified yet.
Rendor Plasma Shot Undercount
Per NKF's research ( http://www.xcomufo.com/forums/index.php?showtopic=242028127 ), the Rendor Plasma gun (an air vehicle weapon) actually has all 140 of the shots it used when loading up. The game divides this by two, reporting 70 shots.
Poor pathway finding
The pathway finding algorithm will choose very poor paths when you move your men in the turn based version of the game. The path chosen will be OK only if you your men can reach their destination following a straight path and there are no obstacles around. Otherwise it will pick very crazy routes. The behaviour of the algorithm is particularly crazy when you are using flying units and more complicate routes can be chosen. Also, the path that your men follows when you move appears to be different from the one selected to predict the TUs left after the move, so that this prediction is often incorrect.