if the ssc pics are programmed, then they should respond to channel 1 on the pixelnet universe you're using. (since it's a USB dongle, it should be uni 1)
on the hub, there should be two sets of jumpers for pixelnet, they should both be set to 1
then you should install 2.1 version of vixen (You are not allowed to view links.
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and also download the plugin for pixelnet from the wiki
setup a quick sequence to use the pixelnet plugin (not DMX)
and see if you can get channel 1 to flash.
if the pic in the hub is not programmed, it'll still output pixelnet to the ssc
if the pic is programmed with the default firmware, it'll respond to channel 1 (first node, first color)
also, if you're trying to program the ssc, i believe you need to same version of the firmware, as the utility being used to program.
also, when choosing your start address in the ssc config utility, make sure you choose your address from the drop down list, rather than just typing it in. (although, that might have been fixed.)