Although i dont get display corruption, IB works fine in p96 mode (dont really mess with aga emu) there is a problem dragging icons on the desktop. they will flicker or go invisable when trying to drag them. its been like this for years during my usage on winuae on radeon cards.
looks like somekind of refresh issue, but ive never found any setting to effect this. ive pressed most options in p96 prefs, nothing sems to effect it.