When the Cholesky of the pairwise complete sample covariance fails, try just starting with the variances and means.
https://openmx.ssri.psu.edu/thread/4079#comment-6338
Fixed with https://github.com/OpenMx/OpenMx/commit/92d7bbf0160f202bf909851cd514aca99ae0f4bf
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#1
Fixed with https://github.com/OpenMx/OpenMx/commit/92d7bbf0160f202bf909851cd514aca99ae0f4bf