When I export my newsletter from InDesign to PDF, the resulting PDF, including all transparent graphics, rasters and effects look great on screen.
When I print the PDF to a plotter (Canon IPF8300), there are no issues and the printed results looks great. However when I print to my office printer (Canon ImageRunner c5045), every graphic raster that has an effect (shadow) or is transparent, does not render correctly and I clearly see bounding boxes around these objects.
The entire document and all source graphics are CMYK. This happens whether i run the flatterer or not.
The problem is that the print shop we are using to produce the final product also sees these anomalies. I have no clue as to why the PDF looks fine when printed on a printer A but not on a printer B and C. The only workaround is to export to image and completely rasterize the entire design.