Unable to change folder "Read" permission


I am unable to change the "Read" permission for a folder. In the Permissions tab (under dolfer properties), I enable User "Read" permission, however, after I click OK it goes back to the previous stage (Read permission remains disabled). For some strange reason, it is not allowing me to enable "Read" permissions.

Has anyone come across this problem? How can I solve it?

Any help would be much appreciated please!