The Chrome browser on Windows has a bug that causes it to misprint PDF documents that contain a feature called transparency. UnForm uses transparency by default to produce shaded objects, such as watermarks, shaded images, and shaded regions. Without transparency, these items become opaque, obscuring anything printed below them in the PDF file. This feature was added in version 8.0.
Unfortunately, as Chrome has become the most widely used browser, and as many users move to browser-based email products like Gmail and Outlook.com, this problem has become more prevalent. The bug(s) can appear in several ways, including incorrectly scaled pages, or black regions on the page.
Until this bug is fixed by Google, there are some work arounds available.
From the UnForm side, you can turn off transparency by adding a 'transparency off' command to a rule set, or by adding the -pdfnotrans option to the uf80c/uf90c command line. If the PDF is produced by a deliver command, then the -pdfnotrans option needs to be added to the "args" parameter. Finally, it is possible to turn off transparency for ALL output by setting pdftrans=0 in uf80d.ini/uf90d.ini. Be sure to test your jobs to verify that PDF output is readable, since some print elements may become obscured. Quite often there are no significant issues.
From the user side, the key is to view the document outside of Chrome's internal PDF plugin, at least when you need to print. The best option is to disable Chrome's plugin and enable the Acrobat Reader plugin (you must have Acrobat Reader installed). To adjust these settings, enter this address: chrome://plugins. Disable "Chrome PDF Viewer" and enable "Acrobat Reader".
Alternatively, you can save the PDF file to disk from Chrome, then open it in Acrobat Reader to print it.
You can follow this bug in the Google Chrome support system. Here is a link:
http://code.google.com/p/chromium/issues/detail?id=373449
Note that there is a star icon at the bottom, where you can indicate interest in the bug. Additional interest might generate more attention from the Chrome developer team.