I have a few dynamic analyses that are setup to be dependant on a modal analysis. I am setting up all of the studys at the same time and using autogem to mesh the model before the study is run. I create a batch file that runs them in series. At the start of the dynamic analysis mechanica checks to make sure the mesh hasn't changed. In my case it shouldn't because I setup all of the studies at the same time and I deleted any previous meshes. However for some reason somtimes the dynamic analysis thinks the mesh is different than the modal mesh. Any clue why this could be? See below for an example from the detailed report. I talked to PTC and they said it shouldn't be doing this but they have seen it occasionally and tweak thier code on a case by case basis when they have a customer send in a model that has this problem.