After selecting "All Levels", and then placing a parts list on your drawing, do you see a bunch of plus signs next to items in your Parts List?
If so, simply expand these to show the levels below. Or right click and choose Expand All to open all children at once for each sub assembly.
Be aware though that placing an indented (or structured BOM) in versions prior to Inventor 2013 may render the line that the indent was made on invisible. This was thankfully fixed in 2013.
The + is just showing that the assembly can be expanded to show the parts inside it. The assembly of course could be empty so would not have a +, bit strange though.
You need to open the BOM.
Change the tab to structured.
select the view options button, (magnifying glass)
select view properties
Select all levels.
This should make the + appear in your parts list.
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