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Mates breaking in complex assemblies


New member
I'm making a little table with 80/20 extrusions and have downloaded many of their parts off the website. Then, I use FeatureWorks to convert the drawing to a SolidWorks part. Problem is, as I embed these into assemblies, eventually they always break. There's no good reason they break, perhaps I change a configuration or just do anything that triggers a rebuild.

Many (or all) of these files downloaded from 80/20 are not fully defined. Could this be a reason these mates are breaking? Any way to fix this (that doesn't involve going into each part and manually defining everything)?