Why does alt_signaltap_run fail in MATLAB?

When alt_signaltap_run is run under MATLAB™, an "Assertion failed" pop-up window is displayed and MATLAB crashes when the pop-up is dismissed.

For Quartus® II software versions 12.1 to 13.0 there is no workaround.

For Quartus II software version 13.1 the following workaround is available:

1. Copy <your quartus install path>\bin\alt_signaltap_run.dll  <your quartus install path>\bin\alt_signaltap_run.mexw32

• Copy <your quartus install path>\bin64\alt_signaltap_run.dll  <your quartus install path>\bin\alt_signaltap_run.mexw64
• Open a DOS command window at <your quartus install path>\dsp_builder and enter "PATH=<your quartus install path>\bin;<your quartus install path>\bin64;%PATH%
• In the same DOS command window, start Matlab by entering:
  <your quartus install path>\dspba\dsp_builder.bat -m "<your Matlab install path>/bin/matlab.exe"
• In Matlab, enter "addpath <your quartus install path>\quartus\bin" or "addpath <your quartus install path>\quartus\bin64" as appropriate.
• Then run "alt_signaltap_run" as normal.

Steps 1 & 2 need only be executed once, and steps 3-6 need to be executed each time you wish to run Matlab with DSP Builder.

This issue is scheduled to be fixed in a future version of the Quartus II software.