Since updating to 68.8.0 when I double click on emails to open them a tab opens but the content of the tab and the window are blank except for a block of text to the right of the window "forward this conversation". It is a link but clicking it does nothing visually on screen. I have 3 IMAP email accounts and all are affected. However when I right click over the email and select conversation view this works. I have deleted global-messages-db.sqlite. which made no difference. There has been a long running issue I have had fror several weeks now which may be related. I can open emails, close them, and a few seconds later the email resets itself as unread. If I open it again it might do the same thing but typically it stays unread after I open it a second time. Also the "replied" arrow that sits next to the email after I reply sometimes appears after I have replied, more often it does not. If it does show, it might disappear if I go to another screen and come back, it very often will disappear if I apply a tag to it. Occasionally some reply arrows remain, but very few. It's a very annoying behaviour which also needs putting right. Windows 7 64 bit. Any help would be appreciated. Been running Thunderbird for many years now!