AI problems with Longbowmens stakes:

This has occurred 3 times now so Im happy to report it as a bug rather than a one-off quirk:

When longbowmens stakes are deployed the AI has problems negotiating them and seem to plump for one of two methodologies both of which need to be remedied:

1) AI lines up its troops in front of the spikes and stands there doing nothing
2) AI lines up its forces at 90 degrees to the spikes and does nothing (When doing this it lines up its troops in 2 rows, one facing one way, the other facing the other way, both at 90 degrees to the stakes, with a column of clear space between them roughly equal to the width of the longbowmens stakes)

Obviously number 2 is the more worrying as it means the AI has some alignment issues (pathing?) with the stakes as well as overall passivity which may be the known passive AI issue.

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Siege bug:

AI attacking a castle with 1 set of ladders and 5 battering rams. 6 units of foot and 8 units of horse.

AI sends ladder men against the wall.
AI drops 4 battering rams and lines entire force up in column formation in front of and behind the 5th ram, AI then walks to the wall with cavalry troops leading the way. Ram is destroyed. AI returns entire column to where it left the rams, picks up another battering ram, lines up in column, walks to the wall (repeat until no more battering rams are left or no more troops).
Meanwhile, although the unit with the ladders has been destroyed the AI resolutely refuses to use the ladders left parked against the wall.

(Faction with the problem was Byzantine on 2 occasions - both attacking Antioch as "large City", not witnessed the bug anywhere else, or by other factions)

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Longbowmen stake planting bug:

When planting stakes of longbowmen if you plant them in group mode at the start of the battle, then when you click "start" a random number of the stakes (for an entire unit) vanish.

If you plant the stakes one unit at a time they appear to always appear. (incidence has occurred twice on different maps with different unit types {basic longbowmen and Yeoman Archers} Nothing similar between the incidents that I noted)

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Fire at Will does not cancel.

GROUP Longbowmen firing at targets set to "Fire at Will" -> Cancel "Fire at Will" and then press "Stop" -> Unit stops firing.
Manually select target for GROUP to fire at -> Unit starts firing but ignores command to Fire at the designated target but returns to firing at its previous target.

Swap to giving units orders individually does not remedy the situation UNTIL you disband the group to issue orders individually to the units.
If you issue orders to the individual units whilst still in the GROUP then they will start firing at the selected target and then switch back to their "Preferred" target.

EVEN when issuing orders to individual non-grouped units the unit will STILL sometimes swap to its preferred target ignoring your commands. (I had assumed that the AI was choosing "greatest perceived threat" no matter what the player did, but longbowmen seem to have a penchant for *all ranged units* followed peasants - whilst ignoring swordsmen and heavy infantry almost entirely?)

(and, believe me, you have no idea how annoying that all is when playing as the English!)