rob,
Sorry that you've had a problem with a WebAssist extension, but one should never have to uninstall Dreamweaver to make JavaScript errors go away. Because such error are sorta common in Dreamweaver (they just happen sometimes, and not just to our extensions), there is an Adobe technote about Troubleshooting JavaScript errors in Dreamweaver. In particular look at items 4, 10, 11, and 12. All of those could be done prior to taking the nuclear option of uninstalling.