Hi,
You might want to skip 2012 and just install the newly released 2013. 2013 has many enhancements which I hope you find useful, such as
- a combined point/rectangle selection
- choosing a load or constraint command from the ribbon displays the dialog box immediately and has a mini toolbar from which you can change the selection
- any much, much more!
But regarding the 2012,
(1) What analysis type? Is the problem the same with other analysis types?
(2) When you choose the vertices, right-click, choose "inquire" just to confirm that only vertices are selected. (another means of confirming a previous suggestion of selecting vertices versus construction points, etc)
(3) After you right-click > "Add > Nodal Forces", does the interface lock up? Or can you continue with other things such as selecting a surface and adding a pressure? If the interface locks up, it may indicate that the Nodal Force dialog is working but appears "off of the screen". If this were the case, I suggest trying just one monitor (if you have multiple monitors) or changing the screen resolution.
John Holtz, P.E. Global Product Support
Autodesk, Inc. If not provided, indicate the version of Inventor Nastran you are using.If the issue is related to a model, attach the model! See What files to provide when the model is needed.