I did an reinstall of rEFIt (and triple booting OSes) on an early unibody macbook pro this week. I noticed that on 0.14 if my Delkin eFilm expresscard34 is in the bay with an unformatted memory card on boot rEFIt will not start. It will start with the memory card removed. The card in question was a 32G formatted exFAT SDHC card. Not sure how it got unformatted, but I assume this is unintended behavior.