The Problem Kids (IE) and Browser Lab Results

It is no surprise that the majority of my testing revolves around the IE 6,7, and 8 problem kids. However, today i was surprised to get a report from a version 9 user. The results (screen captures) I received from the user confirm they are using IE9 but the browser's rendering on their machine is quite different than what I am seeing in Browser Labs. Can anyone explain this? What is the purpose of Browser Labs if we can't rely on the results or if our client stakeholders are able to render different outputs than Browser Labs does using the same browser versions?

Client Stakeholder Setup
Windows 7 using IE 9

Totally different results than what I'm seeing in Browser Labs for same same browser version... I'm in the process of backtracking and there are a couple of tiny details that were overlooked so far that is making things a bit better. At the center of my question for this forum I guess relates to the subversions of browser releases and their importance and/or adoption into the browser labs experience. Are subversion releases a major player and to what impact do should the developers that use Browser Labs afford them?

Thanks,

Shawn