After running the update to macOS 27, we recommend restarting your computer again before launching the 3D Issue Flipbooks app.
If you have not run any other apps you may see this warning when you first run Flipbooks:
Please install Rosetta and then re-open the 3D Issue Flipbooks software.
You may then see this warning:
Please go to Settings -> Privacy and Security -> Files and Folder and check that you have the correct permissions for the Flipbooks and Hotfolder apps:
Now you can run 3D Issue Flipbooks as normal.
Please remember to allow time for the hotfolder service to initialise before you first publish.