It's not IU or any other mod, it's an issue with party size and whether or not you're in multiplayer mode. Sometimes Jasper doesn't show up when he's supposed to. In all honesty, I should have debugged this literally years ago but have never done so, and the right "few hours with nothing else to do" don't seem to be materializing for me.
Generally, the best course is to take all the NPCs you come across with you (including Jaheira and Minsc) until you're ready to leave the Irenicus dungeon. People seem to not encounter problems that way.
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