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I'm not sure but that could be the problem. Here, anything we convert to PDF has a setting of %PDF-1.5 because we had problems displaying anything above that. We can now display PDFs above that because my programmer has recompiled the reading application using the latest libs available.
I don't have anything higher than 1.5 here to test but I'll get someone in the office to convert something with two columns and diagrams to 1.6 and then test it on my EE - will be late tomorrow at the earliest as it can get a little hectic first thing Monday morning.
Again I can't be sure about Calibre and later version PDFs because we've never tried to convert anything above 1.5 and what we have done no one has complained about - will also try this tomorrow if possible (we have win and Linux versions running in VMs on the server).
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