I have a collection of parts (AD_PRT files), an assembly (AD_ASM file) and a drawing (AD_DWG file). I open up my AD_DWG and create a package (AD_PKG). Then I restore the package (in a different location). Almost everything seems to work. All of the files seem to unpack, the drawings look okay, the assembly looks okay. However, in the assembly, a few of the constraints have gone red. The act of packaging and un-packaging had some unintended consequence of messing up those constraints. What is the best way to attack/investigate this problem?