We do not have this issue with our hosts and etherchannels. So far so good...
You can use this document http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004048 to verify your installation and make sure everything is in order as it should. Do not take anything for granted, draw your setup on a whiteboard then confirm your switch and hosts are configured properly. Bonne chance