Officecalc chops off the end of the graph when you select it.

Officecalc chops off the end of the graph when you select it to change data point color. The patch of screen is just left blank. Is this a bug, or am I doing something wrong? If I shrink the graph to below the screen point where it disappears then I can successfully select it and change the data point, but the graph is all scrunched up. If I stretch it so I can see it, then I cannot change the end data points (Say end third of the graph) in any way because they are not displayed on the selected graph. This happens on column or line graphs. The graph in question has 1500 data points. The problem does not appear to be the number of data points but rather the length the graph is stretched to on the screen.

Thanks, Dave