A new user came up with a conclusive answer to [a question of mine][1] on which I had put a bounty a few months ago. I would like to start another bounty to award the user who solved the problem. Why is the "start bounty" button missing in this question? I can see it in other questions. [1]: https://superuser.com/questions/114321/mysterious-xyz-event-files-appearing/181459#181459