Sorry for all the posts!
Tbh I don't really know what I done. I followed these instructions -
http://www.joomlahacks.com/component/option,com_smf/Itemid,94/topic,2591.0
As far as I can see, as long as I edit the forum profile with the new cb fields added (cb_gender, cb_signature etc) it works, but if I edit the forum profile using smf it still gives an error. So I still have the problem but as long as I edit my smf profile through the new cb fields it works!
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