I'm running kde 4.14.2 from kubuntu-backports (4.14.2-0ubuntu1~ubuntu14.04~ppa1) on ubuntu 14.04 with debian stable courier 4.10.0-20120615-1.

I've upgraded from 4.13 shipped with ubuntu due to KDE bug #335090, which is fixed in 4.14.2.
But since then my imap folders are not refreshed any more. That is, new messages in the inbox do not show up, though they do when using thunderbird or webmail.

Looking at the discussion of #338186, I've used tcpdump to capture my imap connection. 
The client only sends:
A000001 LOGIN "hidden" "hidden"
A000002 CAPABILITY
A000003 NAMESPACE
A000004 LIST "" "INBOX"
A000005 LIST "" "INBOX.*"
A000006 LIST "" "#shared"
A000007 LIST "" "#shared.*"
A000008 LIST "" "shared"
A000009 LIST "" "shared.*"
A000010 LSUB "" "INBOX"
A000011 LSUB "" "INBOX.*"
A000012 LSUB "" "#shared"
A000013 LSUB "" "#shared.*"
A000014 LSUB "" "shared"
A000015 LSUB "" "shared.*"
when the online/offline state of the imap account is toggled. But even when right-clicking on the folder and choosing "refresh folder", NOTHING is transmitted on the imap connection.
So it looks like kontact is not even trying to look for new mail.

Reproducible: Always

Steps to Reproduce:
1. start kontact
2. right-click on the folder and say "refresh folder" or just wait


Actual Results:  
no new messages show up

Expected Results:  
new messages show up