First, of course, this problem is not InDesign but the printer setup and the printer drivers. Second: we need to know what Colour Management settings you use: do you let InDesign do the colour managent or the printer do it. Sometines noth happens, which is bad of course. We have no way of telling what you do on the Mac site and on the PC side. In short: we need more information anout you workflow but we can not answer questions about your printer software or settings as we can not look in your systems from here of course.
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