ITunes 11.4 not working properly [Closed]

Registration date
Thursday November 10, 2016
Last seen
January 17, 2017
Devices sync fine and backup / transfer etc. - we can sign in to the store but get nothing but a blank screen. Trying the different tabs - all blank screen.

Checked firewall (tried turning off too)
Checked authorization (says authorized) plus off then on
Ran Disk Utility & Disk Warrior
Tried re-installing 11.4
Tried deleting 11.4 and re-installing 10.5, would not install (says failed). Read in another thread someone else had the same problem of not being able to go back to an older version after 11.4 install.
Any thoughts from those here would be appreciated!