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I guess you are reffering to a drawing view. In that case, I noticed this too, and foundit was because there was a interference between 2 parts. I fixed that the partwas visible again. See if you have an interference between your parts.
In my case there was a piston that I assembled it aligned on axis and a mate at one end. Because of redefining some parts the piston axis was slightly moved by 1-2 mm but that was enough to interferewith the body cylinder and not showing the piston in drawing view. This was my case, maybe there is something similar in your case.
interferencing componetns could cause many problems like x-section without boundary line
in this case try to exclude(blank model, simp rep) somehow components to see with whom it interferences and than modify model by making it flexible or change the posiotion in assembly
If you are working in assembly mode, when you "redefine" a component, any component that appears in the model tree after the one you are redefining, will be temporary suppresed. It works just like redefining a feature in part mode.
If you need one or more of these components visable while redefining the component, you will have to "reorder" these components before the one you want to redefine. Ifyou assembled any of these components relating it to the component you want to redefine, you will have to "redefine" these components, using some other component as a reference, before you can reorder them.
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