On opening Thunderbird this morning (18 Jan) all folders were displayed as expected and Thunderbird connected to my Gmail account but no message was displayed in Inbox, or in any other folder when I selected that. Inbox folder view shows that there are unread and new emails. There are no message filters set. Closing and reopening Thunderbird made no difference. Thunderbird profile file properties shows there is a large amount of data. Yesterday Thunderbird seemed to be operating normally. I don't recall but possibly it was compacting and may not have completed when I shut down my laptop for the day. I ran CCleaner before shutdown. I appreciate your time and advice!