macOS Mail pane not showing proper content...
My Apple Mail application has three panes. The left pane shows the mailboxes, the top right pane shows the latest messages, and the right-bottom shows the contents of the highlighted message.
If I choose a mailbox under "On My Mac" and I highlight a message, it will show me the content of that message in the right-bottom pane but if I then highlight another message, the right-bottom pane does not refresh itself and it continues to show the content of the first message. If I highlight other messages, the right-bottom pane continues to show the content of the first message.
This only started happening with macOS High Sierra. Using 2010 17" MacBook Pro with macOS 10.13.3.
MacBook Pro, macOS High Sierra (10.13.2), 2010 17" MacBook Pro