I've been using bugzilla for ages and still don't know what to do for mid-air collisions. There are two options. As I understand it: - one of them overwrites the changes that other people have made - one of them just adds my comment I'm always nervous since this isn't really clear from the wording ('overwrites' is a hint, but the other option also looks like it does the same, so I'm afraid to use it). Suggested alternate wording: - "Choose this to overwrite all the changes other people have made, and replace them with your changes. THIS DELETES OTHER PEOPLE'S CHANGES." - "Add your comment after other peoples' changes" The above assumes I correctly understand what the two options do.