Okay, so I've got two computers linked to a GPO which has Context Menus disabled using the key:
User Configuration>Administrative Templates>Windows Components>Windows Explorer
Remove Windows Explorer's default context menu
Both computers are Windows 7, the one that is NOT working is 64-bit, the one that IS blocking right-clicks is 32-bit.
Am I missing something? neither computer is linked to any other GPOs...
I also checked the offending account, and the "NoViewContextMenu" setting is set to "1" in the registry key in the user's account:
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Yet still it allows right-click...