The window which shows active quests (not the journal) has an option to "click through" and that no longer works. Reproduction steps: 1. Ensure quest window has "Click through" enabled 2. Face a door with the quest window in front of it (I used one in Plane of Smoke) 3. Try to open the door by clicking on the door by "clicking through" the quest window. 4. Observe that the door does not open. 5. Hide the quest window and click in the same (or approximate) location, observe that the door will open.
When I learned you couldn't click through the quest oveelay i submitted a /bug with deets. Are those even read? No idea, but I do agree with you here.