With today’s release of the Safari 5.1 browser, we wanted to alert you of some compatibility issues and workarounds that relate to Adobe Reader and Acrobat. Adobe Reader and Acrobat are not compatible with the Safari 5.1 browser, announced today. Adobe Reader and Acrobat will continue to work as standalone applications on Mac OS X 10.7 and 10.6, and will render PDF documents outside of the browser, but applications that require the Adobe Reader or Acrobat plug-in to render PDF documents in the Safari browser will be affected. For Adobe Reader, Acrobat, and LiveCycle customers who utilize functionality like forms, digital signatures, portfolios, guides, 3D, extended PDFs and rights management, and who require the Adobe Reader or Acrobat plug-in to render PDF documents in the Safari browser, we recommend that you continue to use Safari 5.0.x and Mac OS X 10.6.
As we continue to investigate this, we will be sure to keep you updated. Currently, we expect to provide a better workaround for this issue before the end of 2011.
For more information, please see Knowledge Base Article CPSID_90885
Steve Gottwals, group product manager, Adobe Reader