Answer:
When opening a model with results and FE mesh in a newer program version, it may happen that the FE mesh and thus the results are deleted. Therefore, we recommend always opening models in the same program version as the last one used. Updates may include customizations in the FE mesh generator, for example, which require deleting the mesh.
Project Manager provides the option to check the file with regard to its properties. You can also see the version number here (see Image 01).
