I installed from scratch the Ubuntu 14.04 and configured it with a Samba share. There is a windows share RAID 1 drive (2 x 1 TB) with Mdadm, that Dropbox and more 2 backup solutions access (Acronis and Allway Sync).
It's perfect functioning, except by a weird thing: I can't alternate users, need to logoff to login other on ubuntu! When a click or enter on the other user name, nothing happens.
I installed other 3 machines with the same settings - except by the RAID 1 drives - and only has this symptom. Any clue?