I have an old installation at the time the user was the name of the application, after creating the master credentials changed the name, now I face some problems with session files, popup that does not close, I believe it is related to this because to magento save information records with The name of another user different from what it has now, then two different ones and when reset the permissions the old one disappears and the new one appears and after a while the old one returns ... it's all gone ... I'm having to clean the files Session several times a day, etc.
Would not it be nice to have an option for us to know which name permissions will be reset?