Was just through something pretty frustrating and am wondering if there is a way to prevent this without disabling the toolbox add in - in the "Add-ins...." menu. We do not use the toolbox fasteners,except for the intial creation of the bolt/nut/washer. We then give it one of our part numbers and update it's status to toolbox part "No". and check it in. On loading a couple assemblies recently and on being updated to SW 2011 SP1, with tool box loaded, Solidworks loads a toolbox part instead of our standard part/fasteners?? Why does Solidworks do this when the tag is not "toolbox"?? That was really frustrating, since the nuts were part of a linkage that threw the assembly into red status.