"Remember User Name" on the Login doesn't always work.
The user's User Name is not being retained in the Login dialog box, even though they have checked the "Remember User Name" option. Why is this?
The cookie which holds this information expires within one week of its creation. So, if you logged in , let's say November 1, the cookie will be deleted November 8. On November 9, you do not see your User Name on the login panel. If you logon anytime within that week, the expiration date gets updated to 7 days after that last logon.
Web Viewer is allowed 248 bytes for storing a cookie, so it's not likely that a user name cookie would be too large to be retained.