Well....
Here is something you can try...
if you open up: /Configuration/Commands/wa_managetheme.js
then comment out like 382 and uncomment line 383.
see if that fixes it.
Also you can try clicking on the fireworks edit button from the property inspector to open up fireworks from DW. Then leave fireworks open and try theme it again. That may work as well, but isn't a great long term solution since we don't want to have to tell everyone to do that.