Are there any tricks to using the PSD Template in Workbench 8.1?

Yes. To make Workbench think that the density material property is
needed it is necessary to insert a small gravity load. This results in an
unwanted static analysis of the gravity load and makes the modal a prestressed
modal. On some models the gravity load results in a dof limit exceeded during
the static analysis or an error about an unavailable file.esav in the prestressed
modal. Making the gravity load very small should correct the first problem and
saving ANSYS solution files should correct the second.

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