3D-PDF playback problems (2 or more 3D-PDFs opened at once)

 

When 2 or more instances of 3D-PDF files are opened at once, you may experience problems with playback and other features. To resolve this, either disallow tabs (Edit > Preferences > General > Open documents as new tabs in the same window) or disallow Protected Mode (Edit > Preferences > Security (Enhanced) > Enable Protected Mode as startup) within the Acrobat Reader settings (or both).