I have a problem with Adobe X Pro. When I want to optimize or reduce the size of a pdf document, in the most cases it doesn't reduce the document but just save the same document with no changes but I make significant changes putting 72 ppi for all imiges! I get this message at the bottom almost all the time "Removing Items" and after that "Saving File" and nothing after that. The size is the same! WHY IS THAT?
The Optimizer only works on images if there is a reduction is size, which may be why it appears to work sometimes and not others. If you want to double check any particular image, you can open the Output Preview dialog under the Print Production panel and select Object Inspector from the Preview dropdown. Then you just click on the the image to find out information about it.