I have been having trouble importing STEP files as assemblies. Either SW will crash or the components will appear as suppressed in the feature tree and cannot be unsuppressed. I found the cause of the problem and thought it might help others out if I share.
The problem was with my assembly template files. I had at some point saved the template after setting the configuration property for the default configuration to “Suppress new components”.
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Unchecking this setting was the solutions. I’m actually doing this in a macro with the
ThisConfig.SuppressNewComponentModels = True
and
ThisConfig.SuppressNewComponentModels = False
statements.