I posted a topic on VideoHelp. After about 30 minutes, the topic appeared in Google (using the key words in the subject line). Later, I edited the subject line a small bit. (The key words remained.) However, after editing, the topic completely disappeared from Google, and never returned. I didn't want to re-post the same topic, so the only way to solve this problem was to post the same topic on another web site. Now my topic is back in Google.