XF 1.5 Error Message When Creating New Thread

Hi there,

When a user creates a new thread they are receiving this error message "The requested thread could not be found". The post goes live as normal but it leads to numerous attempts to start threads until the user realises their thread is live.

The error doesn't appear to be user related as it's doing it for everyone including myself with administrator rights. Any ideas what could be causing this?

Your help is gratefully appreciated!

EDIT: I have located the problem which was a Wikipage Add-on so I have disabled the add-on for the time being. Not sure what to do to get that working again though now :confused:
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