At home (working setup) my IE version is 6.0.2900.2180.xpsp_sp2_gdr.050301-1519. I will report on the work setup(failiing setup) when I get there later today.
And the nonworking version has:
IE version is 6.0.2800.1106.xpsp2.040919-1003
Can you try upgrading IE to the latest version so that it matches your working config? I tried the test page on my install, with the same IE version as your working install btw, and had no issues with it at all. At this point, the only difference seems to be the older IE version on the non-working config.