Simple load ballancing using routing mark vs. ovpn client

Hi guys,

I have two wan ports, two lan ports with multiple subnets on RB450, using very simple load ballancing:
http://wiki.mikrotik.com/wiki/Load_Balancing_over_Multiple_Gateways

It worked fine, until I added OVPN client. If both of wan routes have set some Routing Mark, the OVPN client is not able to connect to OVPN host. If I delete routing mark filter from any of routes, OVPN client connects immediately. How can I set routing mark for OVPN client to use one of two wan ports ? I tried to mark tcp protokol and port 1194 in Mangle-Output chain, without success.

Thank you.

Regards

Peter