What else disables changing IE proxy settings besides Group Policy?

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http://serverfault.com – Something is disabling access to the proxy settings in IE on my (work) laptop. IE is set to use the corporate proxy, so applications that use IE's proxy settings don't work when I take the laptop home. I've removed the local group policy setting "Disable changing proxy settings" using gpedit.msc (I'm in the local Administrators group). However the check-box and edit controls on the LAN Settings page are still disabled. (The "Use a proxy server" check-box is checked, the proxy address and port are filled in, and the other check-box and edit controls are clear.) What else do I need to do before (HowTos)