I'm not a Linux expert but build a NAS using OMV by going thru a tutorial .
It worked but when I applied the latest update today, raspbian stopped to let me login user pi.
symptom is: after boot sequence, GUI login screen appears , I enter user 'pi' and my password, press 'login' then screen goes black and after a while GUI login screen reappears.
during upgrade of ssh I was asked to apply new configuration or keep current config. I had selected 'keep current', might that be related?