Hello,
I have recently had 4.1 SP5 installed and I am also experiencing this problem.
I have tried different ways to build a very simple line graph, but each time I press preview the markers on the line disappear. I can open in preview and they are all there, then come out and go back into preview and only some or perhaps no markers are there?? when I export to pdf it behaves exactly the same, each time I open the pdf the numbers of markers showing changes? (pre preview all markers are shown)
Any help would be greatly appreciated!