I vaguely recall that those older versions of the Adobe RMSDK-based PDF apps had some bugs when rendering math symbols. I've been searching for the thread that discussed it here (and provided a test PDF file), but I haven't been able to find it. It was many years ago. If that's the problem, the solution would be to try another PDF viewing application. The 912 comes with two pre-installed (AdobeViewer and pdfviewer). You could try both to see if one is better than the other. You can also search this forum for mupdfview, a third-party application for PDF viewing that seems to work pretty well on scientific documents. It's easy to install and use, and is my preferred PDF viewing app on my 902.
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