while changing properties i found something like a bug:
Select a directory including some subdirs and files.
Then select 'Properties' in Menu.
Change Permissions To 660, Enable 'Add X to directories', Enable 'Set group, owner and permissions recursively' and press 'OK'
after process is complete, go into directory and check permissions of a subdir. it's changed to 660 but should be something like 760 or 770.
am i wrong??