Have you got Writing with Symbols AND Communicate: In Print V2?
Solution
If so, you can use all the new extra Widgit Rebus Symbols in both black & white AND colour in WWS2000.

Change your wordlist to Widgit Rebus 05_co.wus to get the coloured symbols. Or change to Widgit Rebus 05.wus to get the latest balck & white symbols.
In Writing with Symbols, go to the Wordlist menu and select Replace Wordlist

To make it the default list press CTRL + H
Or, from the Options Menu, choose Save settings now

Now the next time you open Writing with Symbols, your new wordlist will open automatically.