The warning "The following component is not considered in this iteration:" will make you aware if one nondesign space is not considered in the optimization.
The nondesign spaces tear off because either no force or displacement is applied or the force applied is too small. Either you figure out that you don't need the nondesign space or you prevent the tearing off by increasing the force so that the stresses and therefore the relevance of the nondesign space is increased.
If you are using the symmetry function but have generated the whole design and nondesign spaces, the optimizer won't use the symmetrical nondesign spaces and will notify you thereof. Further informaion here.

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