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Quote from: Meho R. on March 16, 2012, 11:41:37 AMWhich PDF version you're exporting to? Note that not all versions support transparency (PDF/X-3 being the most important and common example). Try exporting to PDF 1.4 or higher.
Quote from: Meho R. on March 20, 2012, 02:41:46 AMIf you can post an example PDF file which shows the problem, along with an image for testing purposes, please do so.