I see no issues with the position in your demo, or at least if such issues exist you have not adequately explained where to look for them. When I opened your project I saw the various controls, one of them saying it was a label in the problem area.

At no point did I observe a problem with the positions. What I did see, however, was that the anchors for the various controls were chosen poorly. The test label can shrink vertically with the window and run out of space to display its message, and it is aligned to the right instead of the top right which makes the issue more pronounced when it tries to wrap text.

[edit]
Originally I closed this outright because it looks like nothing more than user error, but your description does make it sound like you're seeing an issue that I am not, so for safety's sake I'm holding this in Unverified. There is a possibility that this falls into the class of bugs, often painting-related, that occur in Windows 7 but not in XP. At the minimum, we will need much more information about what to look for in your demo and what the expected results should be.

Hmm, it may not be a painting thing so much as a sizing thing. I can try to look into it and get some ideas.