Internal Error: Sub-system: DBMUI, File: /quartus/db/dbmui/dbmui_manager.cpp, Line: 1179 - Internal Error: Sub-system: DBMUI, File: /quartus/db/dbmui/dbmui_manager.cpp, Line: 1179 Description Due to a problem in the Quartus® II software version 12.0 SP2 or earlier, you may see this internal error when compiling your design after clicking Update Symbol or Block in the Block Editor. Resolution A patch is available to fix this problem in the Quartus II software version 12.0 SP2. Download and install patch 2.16 from the appropriate link below: Download the version 12.0 SP2 patch 2.16 for Windows (.exe) Download the version 12.0 SP2 patch 2.16 for Linux (.tar) Download the Readme for the Quartus II software version 12.0 SP2 patch 2.16 (.txt) This problem is fixed beginning with the Quartus II software version 12.1. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.1 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']