I have many local folders which i filter my mails to. Starting a few days ago one of the folders will not show the contained mails. It isnt a very voluminous folder just p2p messages. What i usually do is i sort my folders by date and arrange by the criteria... so i have subsections ( today, yesterday, last week, etc ) When i go to this troublesome folder all the subsections are collapsed and they have no tags at all. If i expand one, all i see are empty white rows. I can sort of get around this by clicking on the white rows till i find the mail im looking for but its far from acceptable. This is happening just for this one folder, none of my other folders have this issue and i have others which are used far more intensely. Also i did not install any addons recently, the only addons i have are lightning and signature switch and a theme. Yes this worked for a long time with my current custom theme.