TimeMachine Fails with PowerPC / GUID Partition Scheme / 10.5.2

Just a short question to clear something up:
I have an external drive, partitioned using the GUID partition scheme attached to my MacPro. Before the update to 10.5.2, I was also able to back up my PowerBook over the network to this disk.
After the update, I get the following console message:
2008-02-14 18:49:06 /System/Library/CoreServices/backupd[450] Error: Volume at path /Volumes/Satinav does not appear to be the correct backup volume for this computer.
2008-02-14 18:49:06 /System/Library/CoreServices/backupd[450] Backup failed with error: 18
[This article|http://docs.info.apple.com/article.html?artnum=306932] explains that Time Machine disks should be partitioned with the Apple Partition Map when used with PowerPC-based Macs. If that's so – why did the backup work before the update? Any explanations? Any solutions without having to re-partitioning the entire drive?
Message was edited by: Kaspar Manz

Repairing the Hard Drive and Permissions
Open Disk Utility in your Utilities folder. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

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