I can create new articles, but I can't edit them after. When I try I get... blank space...

Any idea? Thanks.
Fulvio
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LASIX Behandlungen:
{RELATED:5:lasix}
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Behandlungsmethoden / (Liste der Ärzte und Kliniken) / <P> <HR id=null> LASIX Behandlungen:</P> <P>{RELATED:5:lasix}</P>