When checking the "Allow inheritable permissions from parent to propagate to this object" checkbox on a folder, within the NTFS Security module, Security Explorer hard crashes with a "Security Explorer has stopped working" error message.
This is a known Defect and is currently being worked on.
Defect ID: 550982 Inheritance checkbox v9.9.3 crashing
This will be fixed in a future version of Security Explorer, no ETA at this time.