jPV wrote:
It really sounds that you have two boot image partitions, because you can see two partitions on boot select menu. But if you can't see two HFS partitions on HDConfig... hmm.. you don't happen to have two physically different hard disks in your system or something like that which would now contain the other boot image partition?

Anyway, boot image partition (DH0/HFS) is supposed to be shown in that menu, but system partition (DH1/SFS) shouldn't be shown there. Bootable flag should only be on DH1/SFS partition, because it's a flag for booting the MorphOS system, not the Mac itself.

Boot image partition DH0/HFS should contain boot.img and bootinfo.txt and couple of other files and those aren't supposed to be on any SFS partition.

For me it looks that you must have second HFS partition somewhere with the old boot.img. Is it on the same HD or different, but somewhere... I'd look all devices with HDConfig once again :) Old boot image partition might not be visible to desktop, because it doesn't have to be mounted for the operation, so don't trust what you see on desktop/device lists on MorphOS, you must check it with HDConfig or mount it visible with Mounter.