Running PowerPoint 2007 with latest update under Windows 7 -64 bit on Sony VAIO. Charts with data lines formated as dashed shows correctly as dashed in edit wiindow but displays as solid line or what looks like a solid line in slide show on same computer. Reducing the line size to 1 pt corrects this but this line is too thin to be seen easily. Increasing to 1.25 pt shows as solid. Any ideas as to cause and fix?