Internal Error: Sub-system: SEDQ, File: /quartus/sld/sedq/sedq_layout_widget.cpp, Line: 856 - Internal Error: Sub-system: SEDQ, File: /quartus/sld/sedq/sedq_layout_widget.cpp, Line: 856 Description Due to a problem in the Quartus® II software version 13.0 SP1 Windows edition, you may see this internal error when opening a SignalTap™ II File (.stp) file that was created with the Linux version of the Quartus II software. Resolution To work around this problem, rename .stp file to a different name in Windows and open again with the SignalTap II Logic Analyzer. This problem has been fixed beginning with the Quartus II software version 15.0 Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 15.0 13.0.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']