Author: david[at]frankieandshadow.com
[Added to the original trac issue at 5.26pm, Saturday, 2nd December 2006]

A bit more info. The debugger highlights this bit

if(element.offsetParent==document.body)

in the following as the error.

var scale=resolution*OpenLayers.INCHES_PER_UNIT[units]OpenLayers.DOTS_PER_INCH;return scale;};OpenLayers.Util.safeStopPropagation=function(evt){if(evt.stopPropagation){evt.stopPropagation();}
evt.cancelBubble=true;};OpenLayers.Util.pagePosition=function(forElement){var valueT=0,valueL=0;var element=forElement;do{valueT+=element.offsetTop||0;valueL+=element.offsetLeft||0;if(element.offsetParent==document.body)
if(OpenLayers.Element.getStyle(element,'position')=='absolute')break;}while(element=element.offsetParent);element=forElement;do{valueT-=element.scrollTop||0;valueL-=element.scrollLeft||0;}while(element=element.parentNode);return[valueL,valueT];};var Rico=new Object();Rico.Corner={round:function(e,options){var e=$(e);this._setOptions(options);var color=this.options.color;if(this.options.color=="fromElement")
color=this._background(e);var bgColor=this.options.bgColor;if(this.options.bgColor=="fromParent")
bgColor=this._background(e.offsetParent);this._roundCornersImpl(e,color,bgColor);},changeColor:function(theDiv,newColor){theDiv.style.backgroundColor=newColor;var spanElements=theDiv.parentNode.getElementsByTagName("span");for(var currIdx=0;currIdx<spanElements.length;currIdx++){spanElements[currIdx].style.backgroundColor=newColor;}},changeOpacity:function(theDiv,newOpacity){var mozillaOpacity=newOpacity;var ieOpacity='alpha(opacity='+newOpacity100+')';theDiv.style.opacity=mozillaOpacity;theDiv.style.filter=ieOpacity;var spanElements=theDiv.parentNode.getElementsByTagName("span");for(var currIdx=0;currIdx<spanElements.length;currIdx++){spanElements[currIdx].style.opacity=mozillaOpacity;spanElements[currIdx].style.filter=ieOpacity;}},reRound:function(theDiv,options){var topRico=theDiv.parentNode.childNodes[0];var bottomRico=theDiv.parentNode.childNodes[2];theDiv.parentNode.removeChild(topRico);theDiv.parentNode.removeChild(bottomRico);this.round(theDiv.parentNode,options);},_roundCornersImpl:function(e,color,bgColor){if(this.options.border)

Author: crschmidt[at]crschmidt.net
[Added to the original trac issue at 8.28pm, Saturday, 2nd December 2006]

It looks like this might actually be an issue in OpenLayers. If it is, it will be fixed before the end of next week. If it's not, I'll try and find the solution next weekend.

Author: Sebastian[at]SSpaeth.de
[Added to the original trac issue at 11.24am, Wednesday, 16th May 2007]

Does this error still occur or has it been fixed. Not having access to IE myself, I woud be happy if somebody could test this.
Toning down to major, this is not critical in any case.

Author: tom[at]compton.nu
[Added to the original trac issue at 12.47pm, Thursday, 14th June 2007]

This doesn't seem to be a problem anymore.