I experiencing a bug. When I look at an Account page, left panel shows wrong set of related list. The visible set of related list corresponds to Contact.
The same bug is on all other module pages - only related list of standard fields are visible, no related lists of custom Lookup fields.
I tried to configured related list - but "Organize Account Details" dialog shows that none related list is unselected, and Selected Lists list box shows the same wrong set of related list.

I have the same data in Sandbox and it work right here.