Search is no longer working

Hi,

First, I wish all of you (and your family) the best for 2006.

Since a few days, the standard search (next to the address bar in Portable Firefox) is no longer working.
I can type a query, I can press "Return" on the keyboard, but nothing happens.
The icon of the search (by default is Google), it no longer visible. And I cannot change to another search engine.

When I rename my profile, and work with the one that came with the installation of Portable Firefox, the search works. So something is wrong with my profile.
Does this mean I have to create a new profile? Or does someone know how to fix it?

Thanks in advance,
Patrick