Folder Mark All As Read does not work

I have a list of folders (gmail), several with unread messages in them. I right click on a folder with messages and select “Mark All as Read” but nothing happens. Instead I have to go into each folder, select all the messages, then right click and Mark As Read and then they’ll be changed to read.

Some of the folders had over a 100 unread messages and a total of about 200 to 300 messages, so it’s not like marking 5 messages read in a folder of 10,000 messages.

Any one else seeing this behavior with gmail imap mailboxes?