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since the issue seems to be too complecated im trying to provide more info on this cos I believe there's nothing can't be solved. so i noticed that custom fileds search does work only if you specify at least something in the 'Username'. So if I want to search users by the aforesaid 'Source language' I have to choose the 'Source language' I want and at least one letter of the 'Username' it would start with. it doesn't make thigns clear for me maybe sb knows what's going on.