Do you run the test list locally or you are using the scheduling functionality?
If you are running the test list locally, the aiiresult file should be present in the Results folder in your project. Please check there. If the file is not there, clear the application log, run the test list again, and in the behavior reproduce, attach the newly created log for review.
If you are using the scheduling functionality make sure you are connected to the scheduling server, all services are running and try to reload the results. Also check whether you can see the result in Manage Results.