I used (13) kmtest files from bootcdregtest-74451.iso.
Once in this state, trying to run any other kmtest will give the same error.
"All" other tests which use a sub-service do not have this issue.
Virtual PC 2004 SP1 (5.3.582.27) + bootcdregtest-74451.iso : no issue.
It could also be interesting to find out why this test seems not to break (unexpectedly?) on ROS (KVM/VBox)...