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RichardC.ax220RichardC.ax220 

Reports become obsolete after installation from the Appexchange

I have a managed app on the Appexchange that includes four reports. All of the reports work fine in the development account. When I installed the app in another account and try to run any report, I get the error,
"Obsolete Report
This report can no longer be edited or run. Your administrator has disabled all reports for the custom object, or its relationships have changed."
 
I know that I didn't disable reports on any custom object or change the relationships. In fact, the managed app does not allow that. I'm looking for any ideas as to what could have happened when the app was installed that made the reports obsolete. Thanks.