Go back into Vixen profile manager, view your plugins and make sure that the Entec check box is still checked. Many time after editing the com port, the box becomes unchecked. If that doesn't work, cut Vixen out of the picture for a minute and download the DMX deck from the wiki to see if it will make some channels come on through the dongle.
If that doesn't work, the dongle may be suspect. Reflash it for DMX
Link to DMX deck
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LoginGood Luck,
Mike E.