DiskWarrior 4.4 Compatible with OS X 10.9 Mavericks
The previously released DiskWarrior 4 version 4.4 is required to run an installed copy of DiskWarrior while started from 10.9 Mavericks.
If you haven't already done so, you can use the free updater for existing owners of DiskWarrior 4 versions 4.0-4.3.