When installing AutoCAD LT 2010 I chose to migrate settings from LT 2006. The settings were migrated and appeared on the first use of LT. The new ribbon menus were not used; instead, the old style toolbar icons were visible. Later the same day, double clicking on a file opened LT and all the settings had reverted to the 2010 style ribbons and the toolbar icons were gone. How do I get these settings back?