Yes, preview pane is enabled. We changed nothing between when it worked properly and when it didn't. The message header information shows in the preview pane, but the body does not. Opening the message in a new window yields the same result. Opening a compose window to reply, forward or write new, again shows everything except the body. We can forward the messages or send an attachment as a new message, but we can't read, edit or write anything except the header info.

Virus protection is AVG 8.5.392 Free License with email scanning disabled.