Hi Eloy,
I suspect that's exactly what's happening! I'll try deleting the wiki activity and replacing it with the basic wiki code.
I do want to install nWiki eventually, but when I tried to install it in 1.9 I wasn't able to get it working. Perhaps a clean install will do the trick for both the basic wiki and nWiki.
~Caroline
Wiki
Moodle 1.9 basic wiki not working
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