I am having a intresting problem with my mates. i will put in a advanced mate such as a path mate and it will work and move correctly. but as soon as i go to make a change to the assembly (either by adding in a new part i.e. fastner or component) the path mate freezes up or when i close out or switch configurations. the only way i can get it to move again is if i go in to mates suppress the path then unsupresss it. this usually seems to get things moving again. so as you can see i obviously don't want to go an do this everytime, is this a computer problem or is there a box i need to check?