Thank you.
You are using IE 9.0.
We tested the Gantt chart module.
In firefox there is no problem,
The following error will occur. When the following URL(dhtmlx.com/docs/products/dhtmlxG … basic.html) access in IE 9
“Unfortunately dhtmlxGantt 2.0 doesn’t support IE6 and IE7 browsers.
Please open these demos in different browser or in IE8+.”