So, I have had this issue on several assemblies I've worked with recently- I'm not sure if it's a bug with SW2010 SP0 or what.
When I open an assembly some of my parts do not display like they have been fully rebuilt- the parts are missing some features, so they will be the wrong size, etc. If I then open the part and click rebuild the part rebuilds properly and all is fine, I can go back into the assembly and everything is as it should be. This also happens if I open that particular part by itself- same deal.
I have tried changing my "Rebuild assembly on load" setting in options->performance to both prompt and always with the same result. Can anyone offer any help here? Thanks.