Description
Due to a problem in the Quartus® II software, the Node Finder may not match any elements in your design when using the Select Hierarchy Level option. This problem may occur if the capitalization of your top-level entity name does not match the capitalization used in your project Quartus II Settings File (.qsf).
Resolution
To avoid this problem, make sure that the capitalization used in the .qsf assignment matches the capitalization used in your top-level design file. For example:
set_global_assignment -name TOP_LEVEL_ENTITY <case-sensitive top-level entity name>