To fix uses all mu editors aply the this query in query analizer.
Ps.: this action clean all data the your memb_info table.
Without MD5
USE [MuOnline]
GO
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[DF_MEMB_INFO_mail_chek]') AND type = 'D')
BEGIN
ALTER TABLE...