We provided them with these remarks--from which the problem was resolved:
It seems there has been a Java update on the machine (maybe automatic) and at the same time it uninstalled the old--previous
version "C:\Program Files\Java\jre1.8.0_251".
So the environment variable XCOM_JAVA_HOME and XCOM.GLB parameter XCOM_JVM both need to be updated
accordingly--to point to the new Java version installation directory.