email messages do not display in mail app
email messages do not display in mail app. New mail appears, but when I click on it, a blank window appears.
MacBook Air 11", OS X 10.11
Happens to me 1 out of 20 times.
Safe Boot from the HD, (holding Shift key down at bootup), does the problem occur in Safe Mode?
After a normal restart is it then working or not?