Thunderbird is showing a message count as one more than number actually displayed in the inbox. This is occurring for only one of four email accounts. I did search the forum but didn't turn up anything similar. I tried clearing the startup cache under Troubleshooting Information. I also restarted Thunderbird several times. If I select all messages in the inbox, the selected number is always one less than the total count. I tried deleting 3000 messages from the Trash file followed by Thunderbird restart. A daily machine cold restart has not changed the situation. I always empty the inbox before powering off for the night, but after all messages are deleted, the message count still shows 1. I have noticed the problem for about the last week.

The message count discrepancy doesn't seem to be causing any other problems. I just worry about anomalies. Any ideas? Thank you.