I'm a newbie w. using Thunderbird. I just installed it on my Mac running OS 10.11.6 and added my first email account. I can send emails just fine. And when I receive an email it shows up in my Inbox just fine. But when I click on it to view it, the content window is blank. But when I PRINT the email, the content message prints normally. I deleted the message and then viewed it in my Trash folder and it still appears blank. I rebuilt the Inbox folder as suggested in another post, but still have the same problem. Any suggestions? Thanks.