Resolution:
There is an issue in GridServer 3.2.0 and previous versions that will cause Windows Engines to shut down unexpectedly when given certain parameters in the Miscellaneous setting "Do not allow Engines to run except between..." on the Engine Configuration page.

This issue was resolved in the first Service Pack for 3.2, but the following is a workaround that will allow you to schedule Engines to run in hour increments, starting on the hour:

For the Engine start time, enter XX:00. For the Engine stop time, enter YY:59, such that XX is less than YY. For example, start time 17:00 and stop time 23:59 will correctly make the Engine run from 5:00 PM to 11:59 PM.