Ok, so I have this assembly containing two parts. These two parts each have multiply configurations. When I open this assembly and the two parts are in their default config, there is no problem, but if I change either part's config and save the assy, the next time It opens, it wants to rebuild everytime. Even If I rebuild and save changes, it constantly asks to rebuild when the assy is opened again. I've made to sure to go back to two part files and rebuild and update and save them, and they open with no problem, and will save in their own configs and not want to be rebuilt. It's only when these to parts are put into an assy and the configs are not default. Anyone else ever run into this problem? Or know what to do? Any info would help. Thanks in advance, Eddie.