ToME: the Tales of Maj'Eyal

Any time I try to learn talent category from completed escort quest, it's impossible (i can highlight the reward in the reward choice window, but I can't select it (by mouse or keyboard)). It is still possible to choose any other reward (stat, one talent etc.)

Edit: I have just discovered, that selecting this rewards DOES grant it, but doesn't advance quest dialog. So it is possible to get two rewards at the same time.