Kopete-1.0.80 (from kde 4.6.4 gentoo)

http://vk.com/ (http://vkontakte.ru/) is a popular social networking service. He has jabber.

Vkontakte uses jabber:
http://vk.com/help.php?page=jabber

Jabber disconnects every few minutes with message "Malformed packet received".
Psi+, qutim 0.3, pidgin works fine.
Tried servers vk.com, vkmessenger.com. Tried variants with SSl and without.

How to solve a problem?