When exporting a layout composed of 2 or more bar graphs,  all but the first graph show the wrong fill pattern.

This problem happens when you export as jpg or tiff AND your layout consists of bar graphs from several projects. Essentially you've exported the graph from one Prism project into another, and then export to a tiff  or jpg file, and this double export causes the problem. If you export as WMF format, all will be fine. Also, if you merge together your Prism projects so all the graphs included in the layout are in one project, then it will work fine. You'll only see the problem when your graphs from from several projects and you use a bitmap or jpg format.