I was just fiddling with my lvl 7 Cleric (with lvl 1 mage school) and found that after initiating melee combat about 90% of the time any spells executed just hang my character. Even melee stops.
I have to stop the action (spacebar) and re-initiate melee combat to get back in the fight.
Abilities do not seem to be affected but all my spells, offensive and healing, are.
Occasionally, maybe in 1 out of 10 fights, everything works normally. I could not narrow the problem down by type of monster or whether I started combat with melee or by use of a spell. Once I entered melee, all spells hung.