The test cases which staged to simulator do not finish and the operator needs finish the testing from Portal.
And in the simulator.log, there was a WARNING message like:
If the test case includes the loop with a Numeric Counting Data and the setting of the Numeric Counting Data Set like:
and the both property values set non-numeric value, then the loop becomes the infinite loop and the WARNING message for the Numeric Counting Data Set is recorded in the simulator.log
Release: Service Virtualization all versions
Only not to set non-numeric values for the properties for "From" and "End" fields can avoid this problem.