More to do with Dreamweaver CS4?
1) Completely uninstall and remove the extension
2) With DW closed install the extension
3) delete the winfilecache before opening DW
if that doesn't fix it please submit a support incident.
Thanks for the advice - as usual it works a treat. Everything appears hunky dory for the moment.
Seems more to do with Dreamweaver than with Css Menu Writer!
I'd obviously done the right thing, but as Eric Morecambe said 'Not in the right order!'