changing customer email from Admin does not save/update

[msmark]

I have in past been able to add an updated email for client and now it only sometimes lets me do it. At other times oscommerce will show update correctly after I hit update. However when I go in to edit customer account details - name is not updated. Also password reset will not accept new email - in these cases.

 

If anyone know how to fix this please advise. Thanks.