First, do you have my patch installed? You can get the version for b14 at: http://dl.dropbox.com/u/19663978/ZS_nb_quo_b14_b.tar.gz
Second, it would be useful to see the output from the ZS console of the following shell commands:
ip rule list
ip route list table 101
(repeat the above for each of lines that end in “lookup nnn” using the “nnn” value listed.)
ip route list main
iptables -L -v -n -t mangle
This should show how the GUI actually setup the Linux routing and iptables used in netbalancing and QoS. Assuming you don’t actually have a iptables forward rule prohibiting the packets this should help figure out what went wrong.