OK, looks a bug in 4.1.x release. We are at the hostingcon now, will address this issue next week.
Yes, change "Debug Level" to "HIGH" will give full debug log, by default, debug logging is disabled at "NONE" level.
We tested it against 4.1.3 release, it works fine in our lab. Have you tested 4.1.3?
If it still does not work properly with 4.1.3, the best way to address it is to login to your server and take a look.