<p>It could also be MKL; I am not sure.  Based on the behavior you were seeing, my thought is that the error stems from an underlying library under mlpack and under Armadillo.  I'm guessing that when you compiled the mlpack program, it may have used some different dependencies than when you used Armadillo directly.  You could use <code>ldd</code> on each program that you built in order to see if there are any differences in what is being linked to, and that may be helpful in figuring out what is going on.</p>

<p>Another thought I had is that it's possible that this is some threading issue in OpenBLAS, so possibly setting some environment variables that force OpenBLAS to run with one core might be a good way to see if that is the case.</p>

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