Please be aware of the following issue in ARCHICAD 19 and older versions.
Issue: Drawings and hotlinks – which are stored on a mounted drive – are missing from the project and cannot be relinked or updated (solo and teamwork projects are also affected) if at least one user modifies the affected project with OS X El Capitan.
Cause: There were significant changes in the mounted drives handling on OS X El Capitan comparing to Yosemite and earlier versions of OS X. If different operating system users mount the affected network folder and a user places an external drawing or a Hotlink from this folder, then other users will experience that these Drawings and Hotlinks are missing.
For more information about the issue and the workaround, click here.
This issue is planned to be fixed in the update to be released soon.