I right-click on a folder and select properties.
I see the panel and want to change the permissions.
I highlight 644 and type 777.
Nothing happens, I cannot click on OK.
Please note that other controls (checkboxes, button) gets updated only after the focus is moved out of the edit box (when you press "tab" key, click out of the box...). I admit that this may be confusing, I'll maybe change it, so that controls get updated also, when you enter all three digits.
There are problems with the checkboxes too =)
I've tried to click on a couple at random to see if this was working.
It did not work.
Some boxes became greyed out, sometimes the number filed below became empty.
I would say that by "greyed out" you mean "undetermined" state. This state can be selected only, if you select more than one file or directory. It means "leave the permission" as is for all selected files. If any on the checkboxes are in this state, the "octal" edit box is empty, because such a permission cannot be expressed in octal format.
Am I right?