I think i have a similar problem. I installed 10.5.2 over a 10.4.10 installation using the MBR option. Now i have a problem booting. Using the Vista boot loader I get a "chain booting error." Booting with the DVD, the intallation is not detected.

During installation it mentions to make sure that the partition table is clear. Should I do that by reformating the hard drive, and installing again?

And, thanks for the release Zephyroth.