Aparna Module and required fields
Design and Skin Customization
I tried deleting a profile name here and received the error:
Quote:You have entered an invalid value for "profile name" - value must be numbers, letters, spaces or punctuation and contain no HTML. and at least 3 character(s) long
I then clicked cancel, returned to the profile settings, and you are right the name doesn't show. But it is still in the database, and if you empty the form session table it reappears. So it looks like a form session cacheing problem.
This is on a slightly out of date dev site, logged in as admin. What versions are you running? Take a look in the db, empty the form session table and see if you see similar behaviour.