Mobile backups not show up in time machine GUI

Mobile snapshots are missed in time machine GUI. So there is no white ticks on time line, except Current. It may be some kind of missing permissions on folder after update from Snow Leopard?

Current permissions is: drwxr-xr-x+ 3 root wheel 102 11 сен 09:59 .MobileBackups

I've checked this by doing: ls -al /

There are few snaphots with files inside .MobileBackups directory, I can access to files inside of it with sudo, but can't see it neither in /Volumes/MobileBackups nor in GUI.

Please help,

Thanks.