Try uninstalling the reference manual from Studio One > Studio One Extensions and installing it again fresh to see if it still exhibits the same unwanted behavior or if it works correctly. It may only need to be updated or re-installed.
After the uninstall go to the application and "Show Package Contents" and delete the Help folder there to make sure to get a clean install. When you go to install it again from Studio One > Studio One Installation, if a dialog appears asking to install missing or all choose "All"
