IDEA 9: No Hierarchy or Usages

I have an existing project for which I use IDEA 5.1. When I open this with IDEA 9 Community Edition (and after the indexing is finished) I get no derived classes for any use of the hierarchy window, and I get no usages when I do a  Find Usages... search. Everything works when I create a new toy project. Does anyone have any theories?

-Dan

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I think the version gap is too big and import doesn't work well, the best solution would be to create a new project and copy sources from the old one to the new one.

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