The "Analyze Interference" command in Autodesk Inventor (Tools > Analyze Inteference) is a useful command but can be especially useful with the following tip:
When you perform an interference analysis, the command requires you to define 2 selection sets. Every component is selection set 1 is checked against every component in selection set 2. However, the command will NOT detect any interference between components in the SAME set.
To workaround this, only define a single set (put every component into selection set 1) and when you click "OK" the command will check for interference between every component.