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The "use tangent vector field" method should only be used with Conformal mesh 0,1 or 2. In one case I have seen that, if you are using any other kind of mesh such as staircase, the solver automatically adds multiple digits (for example, an index of 1.5000000000000001 as opposed to simply 1.5) in the material index. Since, the index should be single precision, having double precision would throw a memory error. But this used to be the case for older releases.
I think in the newer releases, the log file would tell you to use the conformal mesh. Please feel free to share additional information, if you think something else is causing this issue.
Regards,
Amrita