Last month I upgraded to Mojave and my Mac Mail using my comcast account went to Account Offline along with locking my ability to use passwords that utilize my keychain. I found an answer online that used the command key, one of the File or Mail functions and an arrow key? It "pushed" the mail to go on-line and then all of my password unlocked too. Fast forward to a week ago, I had to reboot my computer, and it did the same thing. Unfortunately I didn't save the "fix" and I can't find it again. Does anyone have any suggestions?