are you connecting via wireless on the Hacintosh? I had this issue for a while... also, what distro did you use to get OSx86 again? I know with LawlessPPC's distro, Bonjour didn't allow me to use file sharing or allow iTunes to let me connect to my AppleTV via wireless or over my LAN but I could use the Remote app on my iTouch. I was also having the same issue you are having with controlling iTunes using the Remote app. I could only solve it by using a different distro. This wasn't an isolated incident either (I reinstalled 4 times) and I never was able to pinpoint exactly what was wrong or to fix it so I switched back to Leo4Allv3 and haven't had any of those problems since.

Hope it helps.

---