I am trying to cast a healing spell, I am using it's hotkey but when I click on the target, my character just walks up to it instead of casting the spell

note: this thing happens on all my spells regardless of level

note2: I can still cast spells from the wuick menu but can't find out how to put new spells there

Just a thought: PST uses AD&D rules, which means that you have to rest to 'remember' your spells before they can be cast. Are you doing this?