Version 7.5 includes an important feature: Undoing actions.
Version 7.4.2 includes a bug fix update
Quoting from Dusan's post in Tomb Raider Forums:
Update: Version 7.5
- Undo command: the shortcuts are Ctrl+Z and NumPad5
- it only works for bone transforms
Update: Version 7.4.2
- another bug fix: assigning the background image didn't work.
Get XNALara 7.5 now!