Using different versions of EA

[Coder]

I noted that EAP file saved on a computer with Enterprise Architect 7.5 can be opened on another computer with EA 6.5. The diagrams will be correctly shown but background color in all boxes, e.g. classes, becomes white. EA 7.5 fills boxes with gradient color and while 6.5 uses one color but I would expect the boxes to be painted with the default yellow-ish color rather that white. Is there a trick to make all boxes yellow in 6.5?