Time Machine and update to 10.5.3: The backup volume could not be mounted

I have the same problem reported by many others. Read all the posts, tried all the suggestions and nothing is working.
Western Digital 1Tb MyBook connected to an Airport Extreme. I can see the sparsebundle file created previously, open it and see the previous backups, and even Time Machine can see them. It just won't back up to the drive after the update from 10.5.2 to 10.53. No problem, however, having Time Machine backup to a FireWire WD MyBook connected to the iMac after updating to 10.5.3.
I hope Apple is keeping track of this issue. It was working really nice and I was impressed how easy it was to set up.

Having same problem here, 17" 1.67Ghz Powerbook G4, after update to 10.5.3 I get "Backup could not be mounted" with Time Capsule(w/ user accounts).
Attempted, to no avail:
  Deselecting Drive.  Would not let me reselect. Able to after deleting keychain items.
  Restarting with no drive selected, then reselecting.  
  Repaired system permissions.
  Mounted Sparse image, and repaired image.
  Choosing backup now
When the sparse image is mounted, i am able to enter it through time machine's view other backup disks, so i think the image is fine.  
the console lists the following entries:
5/29/08 5/29 | 11:32:10 PM /System/Library/CoreServices/backupd[148] Backup requested by user
5/29/08 5/29 | 11:32:10 PM /System/Library/CoreServices/backupd[148] Starting standard backup
5/29/08 5/29 | 11:32:10 PM /System/Library/CoreServices/backupd[148] Network mountpoint /Volumes/sean not owned by backupd... remounting
5/29/08 5/29 | 11:32:12 PM /System/Library/CoreServices/backupd[148] Failed to remount network volume.
5/29/08 5/29 | 11:32:17 PM /System/Library/CoreServices/backupd[148] Backup failed with error: 19
Iv'e tried everything ive seen recommended, does anyone have any ideas?
Thanks, Sean

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