Does curse condition prevent heroes from using all action or just abilities that requires an action? In the case of monsters, does monster can still use regular actions?

Cursed stops a figure from using special or skill actions marked with the little arrow-like symbol, such as the Elemental's abilities. Standard actions such as moving, attacking, resting and opening doors can still be taken.

There is a thread on the question on BGG : http://www.boardgamegeek.com/thread/1014937/what-things-does-curse-stop-exactly

BGG is a nice complementary ressource (and quite often, people over here go on it too).

Thanks for the replies.