I have my preferences set to never watch threads I create or comment in. I have been automatically assigned to watch two threads that I have commented in. This led me to check my preferences and did not see anything that may have been added or changed. I decided to enable the automatic watch thread option and then disable it again, hoping there was a glitch somewhere. However when I looked at the comment box just now, there were checks in the fields to automatically watch the topic when I make a comment. This issue doesn't appear to be affected by all threads as I have made several postings over the last week and have only been automatically notified of two (wish I could remember which two). Which presents an issue of going back to the thread and un-watching the topic, when my preferences should prevent such a thing from taking place. Looking at the options below, the "Watch this topic..." option is not automatically set. The "Yahoo CEO Marissa Mayer hires top Google executive as new COO" is automatically set to watch topic by default.