It is difficult to say. With some of the Solidworks 2017 service pack 4.1 assembly files I am now missing some components on import. If I import those components separately they come in without issue. I do not know if I can replicate these issues since the assemblies I am using are 50+ parts large and contain sub-assemblies. To replicate this effect with open source files would take some time. I would be more than willing to share comparison images if give a send to link. Also If you think it would help to upgrade Solidworks I could try that too. @wim