I'm having a problem with the 'internal page link' content type of cms version 1.5.1 I'm trying to create a portfolio section of a website and I have a structure like:
portfolio-|
|-portfolio item 1
|-portfolio item 2
.
.
|-portfolio item n
The menu link is 'portfolio', but I want it to go to the first sub-page of that section. I've setup the portfolio page with a content type of internal page link and pointed the destination page field at one of the portfolio item pages(say,portfolio item 1) .
That all seems sane enough, the problem is that when I click on the link it just doesn't work

All I ever get is a blank page called 'portfolio' with the normal site menu, at no point does it ever appear to substitute the specified destination page.
I'd appreciate any help people can offer me here. Am I misunderstanding how the internal page link content type works? Is this some sort of bug?
Thanks for any help you can offer.
Mark.