re: Does it do this if you use the arrow keys on your keyboard to move to next in the list; the last

re: Does it do this if you use the arrow keys on your keyboard to move to next in the list; the last one?

The down arrow key only moves the focus to the following folder, and does not land on or display a message in that folder

If the focus is on the Folder in the Folder Pane , then the arrows will move up and down the Folder Pane list.

If the focus in on a selected email in the list of emails you can use the up and down arrows to move up and down the list. As you select an email, it is displayed in the Message Pane below and marked as read. I use this method alot as it is quicker than moving the mouse over any buttons.

I'm trying to work out if this is something related only to the 'Next unread button' or whether something else is conflicting. I presume if you click on the email it is marked as read.. So please tell me if the use of arrows to select emails, still causes the issue.

Test if the Sort Order effects the marking of the last unread email. Please select the following Sort Order and tell me if the 'Next unread' button works with a different Sort by order. View > Sort by > Date - Descending - unthreaded

Do you use the 'Quick Filter Bar' to 'Show only unread messages' - icon looks likea pair of sunglasses? If no. could you please test. Select the 'Show only unread messages' - then use the 'Move to the Next unread mesage' button. Does it still fail to mark the last email as read?

What version of Thunderbird are you using? What OS ? Confirm Pop or imap mail account?

Please test whether their are any addons causing a conflict: In Thunderbird 'Help > 'REstart with Addons disabled' then use the Next unread button method to see if it works ok. If it works ok then an addon is causing an issue.