[PlanetCCRMA] Bizarre GRUB behaviour with Fedora 7

[Pablo Silva]

Hi

I'm trying to get a triple-boot situation (MacOS, XP, Fedora 7)  
happenning on a MacBook Pro (December 2006 version). As has been  
noted on the appropriate sites, the most difficult part of the  
process is getting the partition scheme right, yet what I'm running  
up against since I upgraded to Fedora 7 is the fact that not only  
will the Anaconda installer alter my carefully set up MBR, changing  
the partition filesystem identifiers and bootable flags, _EVEN when  
specifically told to leave the disk alone_, but it will ALSO continue  
changing these every time I start up Fedora, rendering the XP  
partition useless until I do some manual MBR editing.

This is, to put it mildly, unnerving. Has anyone here an idea of what  
is to be done? Changing some GRUB options? Or at least where I could  
ask for help? Any way to complain about this to the Anaconda team? I  
think the installer should certainly be capable of not touching disk  
formatting and partitions if told to from the "expert" menus... Not  
that the Fedora installer is the only one to do this, I had trouble  
with Ubuntu and Studio64 to!

I'm using rEFIt as a bootloader to point the machine to the  
appropriate partition on startup. I wondered whether it was rEFIt's  
fault, yet I didn't have this issue with Fedora Core 6 (which also  
altered MBRs when told to leave the disk alone)

Any help/pointers will be greatly appreciated.

Pablo