>I think you should try renaming the configuration and re-installing to see if it clears this up for you.<
Thank you for your suggestion. As I mentioned I wanted to avoid this if possible as it can be time-consuming and wondered if there was any change which installing the extension might have made which I could undo manually (eg editing menus.xml). As it happens I came across a post on another forum which suggested deleting another configuration file:
C:\Users\username\AppData\Roaming\Adobe\Dreamweaver CS4\en_US\Configuration\ServerFormats\PHP_MySQL\Formats.xml
Surprisingly this did the trick and I could then reinstall the previous version of SecurityAssist. Installing the beta version seemed to cause the problem but it was possibly coincidence - I didn't want to risk it anyway.
I expect reinstalling everything is the only solution in some cases but if you take a cautious approach it can take a very long time to install WA extensions. I think some have suggested it's alright to click 'Yes to All' to the install dialog but given this is likely to mean overwriting new js files with older versions, I am not confident with this approach. Unless you think this cannot cause problems, would it possible for WA to provide a list in the WA extension download section, indicating in which order the extensions should be installed (presumably by release date)? I would have thought this would be very helpful and make re-installing a great deal easier (and less likely to cause hand injuries). Do you not think this would be useful and reduce javascript error issues etc.? I expect you have such a list.
Tom
