When I use the latest version of ElkBuffBar (from files.wowace.com), the tracking button on simpleMinimap disappears (this happens with old and new versions of simpleMinimap). Reverting to an older version of ElkBuffBar (from curse.com) fixes this problem.
Sorry, I didn't see the new option that allows you to hide the tracking icon on the minimap, which apparently defaults to enabled. Please disregard this bug.