Quote Originally Posted by FactionHeir
The one where:
1. if you load a game where a unit is still in retraining and do not remove/reenter it
2. if (sometimes) you build a building giving a local experience bonus to a unit type trained
3. if you add/remove a unit repeatedly from train/retraining
4. or even sometimes randomly occuring

All unit training facilities you own will churn out experience 0 units (either trained or retrained) until you fix it by removing all units from training AND retraining queues and perform an action that resets the seed (i.e. spying) and then end turn.
Sorry, that makes no sense to me, can you go over it again but with a bit more explanation.