NAs in definition variables

Does OpenMx support NAs in definition variables?

Here's a test file, which allows you to create data in a twin model with covariates on the means, either including, or excluding rows that are NA on the definition variable.

With NAs in the def vars, it runs (under OpenMx version number: 2.7.12.47), but the results appear to be the start values.

Question 3 in the IBG forums is relevant to this also.