I have tried your samples for the Stacked Bar and StackedBarH on your website, they are working fine in all browsers, but for me, not in Firefox, where only the first column is displayed. I am using a Beta 6.0 Firefox.
Thanks.
This is my first post, I congratulate you on a brilliant product.
the sample dhtmlxChart/samples/06_bar_chart/05_stacked_chart.html renders a chart in Firefox 6.0. Could you attach the complete sample to reproduce the problem locally.