Finally started using the menu system, we installed it on our CMS first after a few false starts it works bootifully have now installed it into the Invision forums and there is a weird error (screen shot should be below).
We are not hugely expert at JS .. we tend to muddle through mostly but this one is a bit out of my league Site is http://razorbackrailway.com
Seems the problem is only on the main forum page .. must be a JS conflict with category collapse or something .. hohum
Yup found it .. one of the components was the cause investigating now, amazing how you can stare at something for hours and as soon as you ask for help it jumps out at yah!
It was D22-Live Board Life Status v1.0 the JS it uses conflicts with the menu system, I simply trashed it as the display is only fluff. The author tends to be a little (ahem) slack with his code and I didn't want to waste time trying to actually resolve the issue.