We have some PDFs that are not rendering in SharePoint preview windows. Large percent of the text is not visible on the screen. The 'missing' text is actually present in the page source code, but is somehow hidden on the screen (z-order problem?).
The PDF's render fine directly in all browsers, as well as in all PDF editing apps.
We've tried different browsers, different machines, different networks, and in-private/incognito connections. None of this points to a browser specific issue or caching issue.
Has anyone seen this? The issue surfaced about a week and a half ago. We opened a support case with Microsoft but the experience has been bewildering, to say the least.