Language switch redirects to !trash (nonexistant page)

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Hi all

I set uphttp://www.casa-campanula.ch, with the internationalization add-on. So far so good. But somehow, when switching from German to English while on a "pictures"-subpage, it redirects back to some !trash-page that does not exist anymore.

Go to

http://www.casa-campanula.ch/index.php/de/das-haus/bilder/...

and hit the English flag on the bottom right. You'll get redirected to

http://www.casa-campanula.ch/index.php/!trash/the-house/bilder/...

instead of

http://www.casa-campanula.ch/index.php/en/the_house/bilder/...

what it should be.

What am I doing wrong? I tried copying the page tree from DE to EN again, but it won't copy subpages (Bilder).

Thanks,
RizzzO

RizzzO