I've posted before in this thread, but people seem to be ignoring me. My own GPT fdisk (gdisk) package can create hybrid MBRs with a great deal of flexibility. It should be possible to use it to fix any problems that are caused by corrupt hybrid MBRs. Please review my earlier posts for additional details and other suggestions, and read my hybrid MBR Web page for information on hybrid MBRs generally and on how to create them in gdisk. Note, however, that I don't have a dual-booting Intel-based Apple Macintosh, so I have no first-hand experience with this specific problem.
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