Graphics loading issue - possibly related to group join bug?

My husband is having issues with his graphics - nothing loads (items in bags, mobs on screen, effects like fire/ice/etc.) so he did a repair but it did not fix. When he opens his bags, they open empty - then a few seconds later the items populate. Same when we’re exploring - he doesn’t see mobs/effects/etc for 10-20 seconds which has made the game an unplayable, unfun, death trap for him.

ETA: we also have to click a bunch of times to pick up items.

Plus whenever he tries to repair/restart we end up with the group join bug mentioned here: S-19 Group Join Bug