I tried a clean install (+ new profile) and it works now.
Just for info:
What I was doing, as the problem appeared, I just updated k-m 1.1 to 1.12.
After that k-m crashed any time I click on the arrow on the toolbar or the word "Bookmarks" in the menu.
What I do not understand I had to delete the k-meleon directory in "documents and settings" in order to work again.
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