or embed them into the file.Where are you getting the PDFs from?
In our shop we have a shared server for various designers to drop files into. When I go to open them I can see the images but they will sometimes not appear on the print. This is because the image's file path is on their local server and not the shared server. When that happens I have to have the designers go back and save the image in the shared server.
I had this issue once and it was because of that reason. John since you are using Flexi click on the images that are not showing up and see if the Overprint box is checkedI bet those images are set as Overprints, which show up in the RIP, but do not actually print.
Please don't don't that. lol.. I open in photoshop and resave it as PNG...
SAI owns flexiWhen I print I have to make sure that the include image button is on, if it isn't my HP won't print the pictures. I'm using SAI also, make sure in the preview you are on print tab.