Karpersky Internet Security blocks IMAP folder listing?

Recently I uninstalled Kaspersky Internet Security (KIS) 2014 version, because it seems to block updating Ethernet (Intel I217-LM) driver. Finally I succeeded to update the driver, and then I reinstalled KIS --- actually, upgraded KIS to 2016 version.

Suddenly after installation, Thunderbird (open-source mail client) complained some IMAP folders cannot be found, and so message filter rules associated with those folders were disabled. Indeed those folders were not listed on Thunderbird, even though they were seen when I accessed to mail service via Web interface.

Pausing KIS and restarting Thunderbird, those folders were successfully listed. So KIS must be the cause of the problem. I tried to toggle each of KIS protection functions on/off, and eventually found that the problem is solved when I disable BOTH of two functions below:

• "Scan POP3/SMTP/NNTP/IMAP traffic" option in e-Mail protection menu
• Anti-Spam function

I hope this article might help someone who have similar problem.