Hi there, for some reason my companions stopped using any potions as soon as they need it. Rather unfortunate when playing a priest relying upon the tanks.
It still works to drag potions at their companion items but that's useless for serious fights!

Is it an option I deactivated by mistake or something?
Couldn't find anything about it at the manuals (or at least missed it).

I don't have it available right now myself, but if you look in the manual there should be some key bindings for the keyboard that do things such as change what mode your companions are on and enable/disable potion use. You may have accidentally hit that key while playing. It should be in the keyboard controls.

Thanks, you're right, there it is - it is a group command:
Allow / forbid the party to drink potions - default "D"