Hi Olivier :)
well, it's fixed - but I'm running a bilingual site, and now the German aliases are used for the English translations. Furthermore, it first wrecked my template - the item was published with the 3rd level menu in the footer :o, and now, I can't translate (Joom!Fish) another extra field if it is a link.
I will probably now try a work around, as the original version used the categories and sub categories properly - I will place my SEF necessities in the category name :)
Thanks for your help anyway!