I've started my second playthrough on 3 days ago after reading that Gale's scenes can be triggered only before gatting his approval "Very high"...
Didn't help me. I got his artufacts quest convo twice (same thing happened on my first playthrough) before I got the sword from Anders and after. So I kept it wit h me to see if anything else comes up but no. Now whatever I do (even pet the dog) his approval will go "Very high" so I'm stuck again XP