I used to get a list of revisions, probably in v18 (I can't try it now), but I've never been able to get anything more than a list of revisions for the current branch. When "Show branches in version history tree" is enabled, what should I expect to see? (without that enabled, I see list of revisions for the current branch).
Also, if I enable "Traverse parent branch history" it doesn't seem to do anything different than with it disabled - that is, I get a list of revisions for the current branch.