Create New User

I developed my first WordPress site on my localhost, then transferred it to the server. Everything seems to work and look great, except that I cannot create a new user. When loggin in as the admin, I create a new user, enter all the info, and it says the user is created. However, there is no data in the user field (i.e. – username, name, and email are blank, role says “none”). When I click to edit the user it returns “Invalid user ID”. Not sure what to do…