I'm having a problem whith portal news. If I browse the news unfiltered or filtered by category then all goes fine, but if I browse them from the archive, filtered by date, then the news text is not parsed and it's shown as raw text instead, showing all the BBCode.

I've been searching the forum and didn't see anything about this problem. It's known? I'm doing something wrong? It's there a solution?
Thanks in advance.
Angel Garcia.