DiskWarrior 4.3 Compatible with Mac OS X 10.7 Lion
DiskWarrior 4 version 4.3 was released in March and is required to run an installed copy of DiskWarrior while started from 10.7 Lion.
If you haven't already done so, you can use the free updater for existing owners of DiskWarrior 4 versions 4.0-4.2.