I am experiencing something different than you are saying for running jobs sequentially on Windows 10. When I create a .BAT file as you have earlier described (see below for your .BAT file structure), they run simultaneously. Is there another way to ensure they run sequentially?
I'm running NX Nastran verison 11.1.
Batch File Structure Content (reproduced from JimB's post on 05-19-2014 08:38 AM):