When I create a powerpoint 2008 (.pptx) file on my Mac and then move it to a Windows machine the fonts and spacings get all messed up. I'm using a common font (Arial) which is present on both machines. My Windows machine is running MS Office 2007 and I tested it on a machine that runs MS Office 2003 as well. Both PCs screw up the fonts at random. Why is this? How can I work around this? The results are the same if save my powerpoint file as a .ppt on my Mac. I don't think this is a Office version problem; I think this is a Mac/PC problem. What's up?