IE9 1px background-shifting bug?

Since Tuesday, I am testing the new (final) version of IE9. In one of the first (web) designs I tested in it, I discovered a strange 1-pixel background shifting bug [full description]. However, till now I wasn't able to find anyone who can reproduce it on another Win7 + IE9 computer...

Since Dribbble is all about design and feedback and helping each other, I would greatly appreciate any help in tracking this strange issue! :-)

If someone else (except me) can reproduce the issue, then for sure, a new bug may have been discovered, and then we can search for the cause of it (what triggers it?). But if only I see the issue, then maybe something is wrong with my setup and I should try to find out, what...

I wrote a short blog post about the bug in question, along with screenshots and a test page.

Please help! :-)