Every morning when i fire up my VM and IE (in my host OS) and go to my SP site it always logs me on automatically as DOMAIN\george which is a user I created for testing permissions.
So every morning after that I click "sign in as a different user" to sign in as my sys admin user instead and most days that is the only user I use. Any idea why george's credentials are being cached?
Part of "firing up my VM" is running a script that starts IIS as well as some services. I'm not entirely sure SharePoint is responsible for this, could very well be ASP.Net.
EDIT: I've already tried clearing my cookies.
Had a very similar problem! To solve it, go to 'User Accounts' under the Windows Control panel.
Navigate to 'Manage your network passwords'. Select the domain you wish to clear and select 'Remove'.
You should now have a clean login dialogue box and when you check the 'remember me' box, this will be stored as the login default for that domain.