Urgh... starting to struggle to make use of these logs. I went to change the setting, and I noticed the task said it was already running. Felt like a good sign. Changed the dropdown as directed, restart... nothing, no sound. Get back in, log shows a successful run of the task? That can't be right. Restart again; again no sound, but this time the log shows the error from before... and further, it shows a "task registration updated" event right after, which, well I definitely didn't do any updating of task registrations as the computer shut down, at least. Another restart, same outcome—but no "updated registration" this time.
Also noted a registration update immediately before the successful run log I mentioned at the start, guess I just missed it before. That one, at least, would coincide with me updating the option.
All of the errors have the same details as before, only difference is the timestamps.
...anyway, have you noticed tasks can be exported? I've attached mine here (forum doesn't allow us to attach .xml files for some reason so I've changed it to a .txt—just change it back), seeing if it works or not on your end ought to be pretty insightful.