Fafnir13
King
When you gain access to certain national units like Knights, their prerequisite becomes unaccessible until you have filled the national unit slots. Upgrading to an intermediate (like an axeman to a champion) also seems to be blocked. These blocks can be quite troublesome as the player may not be able/willing to fill those slots right away for any number of reasons.
There is also a bit of micromanagement trouble as prerequisite units you had queued will automatically upgrade their production to the new one. In a Hippus game yesterday, I had to spend a bit of time looking through all of my build queues to find where the a knight was which was blocking the upgrading if a high level horse archer.
The current work-around would be to cancel all build orders in your main cities, head over to one of your slower production cities, and plop all the national units in there, filling the slots but ready to be canceled well before they'd ever have a chance to be built. Not the smoothest operation. Making it so national units don't block regular ones would be for the better.
There is also a bit of micromanagement trouble as prerequisite units you had queued will automatically upgrade their production to the new one. In a Hippus game yesterday, I had to spend a bit of time looking through all of my build queues to find where the a knight was which was blocking the upgrading if a high level horse archer.
The current work-around would be to cancel all build orders in your main cities, head over to one of your slower production cities, and plop all the national units in there, filling the slots but ready to be canceled well before they'd ever have a chance to be built. Not the smoothest operation. Making it so national units don't block regular ones would be for the better.