Normally the execution server is supposed to create a new Results folder as part of the project copy operation from the source to the temp folder as part of running the requested test list. However if the settings.aiis file is missing for some reason (e.g. forgot to check it into source control) then the execution server fails to create the Results folder. In the end you get two errors reported on the Output tab of the execution server, and no results can be seen in Test Studio for the scheduled test run. The two errors reported are:
1) "Unable to load the project the test execution depends on!"
2) "No result folder found at ..."

Without a result folder and no result file, you cannot diagnose why the test list did not run looking at the Results tab in Test Studio. Reload from server doesn't help because there's no result file to retrieve.