Since 2.08 came out (might be after patch one though), whenever I minimize AH I lose my mouse pointer until I hit the windows key and then the mouse pointer comes back.
I am always alt-tabbing out of the game and this was never an issue before.
Windows XP Pro, AMD 3200+, 1 gig ram, gigabyte mb, FX5700 vid card with an Audigy 2 sound card. Also running DX 9.0c.