I'm surprised no one has replied to your issue. I assume your sub-assembly is set to flexible? I wish I could be more help, but I'm on vacation and don't have access to SW, so I can't open your model. At least this will bump it up to the top.
Please include all related parts to check the issues.
Also make sure you've enough degree of freedom in the components to make them rotate.
You never included the part files so I am unable to look thoroughly at the model. However it doesn't look like you have set the sub-assembly to flexible in the top level. Try this and it should work. If you have already tried this could you include your parts as well so the full assembly can be looked at?