Problem with the TOC in the Firefox browser

Dear Experts,

I am using the Lectora Table of content (tree view) in a course.

My problem: the TOC does not always highlight the page that you are currently

on nor does the Lesson always expand that has the current page.

The problem only happens with the Mozilla Firefox browser.

I tested it with Firefox 3.6.3

No problems with IE 8 and Safari 4.

I use the Lectora Enterprise Edition v. X2a

In the TOC menu I dont't activate the "transparent frame" button

(I tried both, but it made no difference).

(Screenshot attached).

Thank you for help and greetings from Frankfurt, Germany.

Jürgen Kiel