I'm a student in an Intermediate GIS class and I'm using ArcGIS 10.1 on my Windows 7 Pro computer. I've spent 1.5 semesters exporting my MXD files to PDF, but now ArcGIS is ignoring some layers in one of my assignments, and I don't know the reason. I'm using the GIS Tutorial 2: Spatial Analysis Workbook, and I'm trying to export the map I created in Chapter 5-8, pages 188 and 189. I can see everything on the screen the way it is supposed to be, and my legend is correct, but the polygon feature classes that I created to demonstrate network analyst are not showing on the PDF. If I export to BMP, the feature classes show, but they don't show when exported to PDF. Does anyone have any ideas how I could get those three feature class layers to show in PDF?