On the contact screen, I click on the contact's email address, the 'email contact' screen pops up but the "To" field is blank. This works correctly on the demo site.
Set-up: Joomla 3.4.3, CiviCRM 4.6.8 (but have had this issue w/ previous Joomla and CiviCRM versions)
Is this a corruption of one of the files? What can I check on?