history not searched when typing in location bar

Hi,

I opened a topic over at the mozilla forum because I'm experiencing the problem that when typing in the location bar my history (sites I've visited before) is not searched. Only sites I've TYPED before are searched.
They suggested it might be an issue due to my portable version.

Here's the original thread: http://support.mozilla.com/tiki-view_forum_thread.php?locale=en-US&comme...

Any hints are highly appreciated!