Actually, the forum software is making that change to that 3-letter word for insect, because we have specifically instructed it to do that (via the censor). Since we use the forums for beta tests, we frequently need to search for the word '_bug_' in the beta forum, and the new forum software that was installed at the end of last year is not set up to allow 3-character searches like the old software was. So, every time someone uses that particular word, it changes to _bug_ so that we can search on it. Maybe we should add this answer to the FAQ, since it gets asked about so often?