After patch v3.0.158.595 i have mega-bug with all consuables.
As an example of an arrow. you lose 2 AP when you take it and 2 AP more when you shoot, totaly - 4 AP with arrow's shot.
applies to everything - arrows, grenades, scrolls etc.

i want back-up :(

Can confirm this, i noticed this with arrows first later realised the same happens with scrolls.

Can confirm as well. Can't use res unless you're full AP? Pretty game breaking.

I created an account to comment on this. I too am experiencing this problem. The game is completely unplayable like this.

Basically in combat, selecting usable items scrolls, grenades, potions, arrows, etc... consumes the AP cost, and then consumes it a second time when attempting to cast/confirm. This really sucks, can't see how I can continue my current save with this.