Dynamic issue with NaN

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Hi All.

I have an issue with PSS/E in refrence to applying a load model. When I apply a load model to a single SMIB, such as IEELBL or CIMWBL, my initialization fails or if it does not fail it produces a NaN error as it iterates. My generator is a simple GENCLS, so there should be no issues. If the load model is not applied, it works fine. The parameters used for IEELBL or CIMWBL are all standard. Why does this occur?, there is little information around on this. Can anyone help? I do at times get a error message "INNER LOOP NOT CONVERGED ON OUTER ITERATION" and cant not calculate slip? anyone know how to resolve this?

Thank You in advance.