Post a screen shot along with the version of IE, please. So basically, it seems that it happens on all versions of IE 6-8, but only intermittently? Maybe one of the ads is the culprit?
got it again with this thread but on a work pc, the "Speck" ad is displaying, I have a screen shot of this. Interestingly enough, when in the reply mode the layout is correct as no add shows at the bottom of the page.
And on further comparison as after reloading I got the ironkey ad, it appears that the table/section that the ads show in doesn't display correctly as the shaded box area is shorter in height, on a bad page the shaded area stops immediately below the ad, on a good page you have the shaded section going about 5mm or more below the ad.