Service Pack 2（v10.0.4002.2012）で修正済み。

Service Pack 2を適用せずに対処する場合、この問題に対応したスクリプトをaspxファイルに追加することで回避可能です。

[JavaScript]
<script type="text/javascript">
    window.onload = function () {
        GCIM.ListCommand.prototype.GetTopIndex = function () {
            var scrollTop = this._render._dataContainer.scrollTop;
            var min = 0;
            var max = this._data._visibleItemIndexCol.GetLength() - 1;
            if (this._render._htmlTable.rows.length == 0 || this._render._dataContainer.scrollHeight == 0) {
                return -1;
            }
            var previouseMiddle = -1;
            while (min < max) {
                var middle = Math.floor((min + max) / 2);
                var middleRowIndex = this._data._visibleItemIndexCol.GetAt(middle);
                if (previouseMiddle == middle) {
                    return middleRowIndex;
                }
                var middleScrollTop = this._render._htmlTable.rows.item(middleRowIndex).offsetTop;
                if (middleScrollTop > scrollTop) {
                    if (middle > 0) {
                        if (this._render._htmlTable.rows.item(this._data._visibleItemIndexCol.GetAt(middle - 1)).offsetTop < scrollTop) {
                            return middleRowIndex;
                        }
                        else {
                            max = middle;
                        }
                    }
                    else {
                        return middleRowIndex;
                    }
                }
                else if (middleScrollTop === scrollTop) {
                    return middleRowIndex;
                }
                else {
                    min = middle;
                }
                previouseMiddle = middle;
            }
            var result = Math.min(this._data._rowCount - 1, this._data._visibleItemIndexCol.GetAt(min));
            if (isNaN(result)) {
                result = -1;
            }
            return result;
        };
    }
</script>