Attempting to print will sometimes bring up a message saying that there
is not enough room in the buffer. Re-trying printing will often work.
Copying a contour plot sometimes shows the wrong plot or random graphics.
Solution:double click on the pasted plot to start PrismGRAPH, then
close PrismGRAPH.
Intel Mac 10.5 Features involving drag and drop (moving text boxes, moving line plots from one graph to another) don't always work for versions less than 5.5.0..