Higher export volumes and lower administrative expenses supported earnings, while rising input costs squeezed gross profit.    Chilean wood-based panel producer Masisa narrowed its third-quarter loss attributable to controlling shareholders to US$3.9 million, from US$4.7 million a year earlier. Revenue rose 5% to US$72.3 million, supported by a 13.1% increase in North American moulding sales volumes. EBITDA increased to US$3.6 million from US$2.6 million.    Higher sales did not translate into stronger gross profitability. Cost of sales increased 7.8% to ...