Problem with KMail and Yahoo Mail


I am running OpenSuse 13.2. Recently, I wanted to start using KMail with my primary email provider which is Yahoo. I was able to set it up to use IMAP without problems and it looks like it is working. It allows me to send mail, it synced all of the folders I have with the exception of the inbox. KMail synced all items older than 2013 in the inbox even though it did all dates of mail from other folders but nothing beyond 2013 in the inbox. When I go into configure Accounts and watch the downloading progress, I can see it slowly ticking up the % complete for the inbox but then often will go back to 0% before completing and start again or it will just show other folders being done.

I would appreciate any guidance anyone had on how I can investigate this issue?