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From what I can gather, seems that the profile module maybe checking to see if the field is empty and return an error because it is not.
Can you guys tell me which version of Xoops, Profile module, php version and MySQL version you are using please?
I will have a proper look though that php error/mysql test you posted, that might help point me in a direction.
Would one of you please post this in the sourceforge bug tracker please. (Just so I don't forget about it)
Catz