Some Graphs Print Others Dont!

I can reproduce the problem when printing at 600dpi

Although not being able to print at this resolution is certainly a bug/problem I do not know of a work around if their printer will not cope with higher resolutions.

That said the main problems are caused by the ghastly choice of gradient fills and mock 3d chart types.
I would suggest revising the chart styles not only to get around the printing problem but also to produce more readable and in my opinion professional looking charts.