Critical Issue
Description
In the Quartus II software version 15.0, the Technology Map Viewer (Post-Mapping) fails to load the schematic of your design netlist when Analysis & Synthesis or the full design compilation is complete. The failure occurs because the Partition Merge process did not run.
Resolution
To run the Partition Merge processs, navigate to Processing > Start > Start Partition Merge once Analysis & Synthesis is complete.