Firefox 6 won't show course if links set to open in wrapper

I have installed:

Joomla 1.5
Moodle 1.9
Joomdle 0.6

And all is fine - except in Firefox 6

In Joomdle > Configuration - Links behaviour, if I have Wrapper selected - the Course overview appears but when I click on Go to Course, the Content disappears, I just see the breadcrumb and the footer.

If I turn off autoheight in wrapper in Joomdle config and I add this to css:

.wrapper {
border: 1px solid #069;
height: 600px;
overflow: visible;
}
then the content appears, with scrollbar.

This isn't really ideal and I wonder if there is a better fix?

Any help would be much appreciated.

Sorry, but we are no Javascript experts, nor have we tested Firefox 6.

If you know somejavascript you could try to debug why it work in other browsers and not in FF6.

Auto-height code was contributed by a community member, so I am not that familiar with it.