I have a WebDialogWindow on a page that's controllde mainly from javascript, and there are a couple server controls on it.  I'm using Chrome 2.0, and this is the error I tend to get when I click the button for a postback:

System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: value
at System.Web.UI.WebControls.Unit..ctor(String value, CultureInfo culture, UnitType defaultType)
at System.Web.UI.WebControls.Unit.Parse(String s, CultureInfo culture)
at Infragistics.Web.UI.Framework.ControlObject.ConvertToUnit(Object obj, Unit def, Boolean allowNegative)
at Infragistics.Web.UI.LayoutControls.WebDialogWindow.get_Top()
at Infragistics.Web.UI.LayoutControls.DialogWindowBot.LoadClientPropsTransactionList(Dictionary`2 list)
at Infragistics.Web.UI.Framework.ObjectBase.LoadTransactionList(Boolean deferLoadPostDataProcessing)
at Infragistics.Web.UI.Framework.RunBot.LoadClientData()
at Infragistics.Web.UI.Framework.RunBot.HandleLoadPostData(String postDataKey, NameValueCollection postCollection)
at Infragistics.Web.UI.Framework.ControlMain.LoadPostData(String postDataKey, NameValueCollection postCollection)
at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
--- End of inner exception stack trace ---

Does anyone have any idea why I'd be getting this error on postback?