Robert,
Not sure if this helps but I ran into the same behavior. I had to no out the VPN client command on the 5505 then re-apply the config.
no vpnclient enable
vpnclient server x.x.x.x.
vpnclient mode network-extension-mode
vpnclient nem-st-autoconnect
vpnclient vpngroup myEZtunnel password ################
vpnclient username ########### password #################
vpnclient enable
This is my working 5505 side config.
Josh