Hi Adam, welcome to mobileread!
Unfortunately I can't help you with your problem, only offer two ways that you could try:
- Have you tried both pdf viewers? The Pocketbook 603 has the "Adobe Reader" and "pdfviewer" to display pdf-files.
- Do you have a possibility to change your pdf file, like, for instance, go in Adobe Acrobat to Advance/Optimise pdf and change the compression style from ccitt4 to zip?
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