Unfortunately, we couldn't reproduce the issue. However, our developers have managed to find what is causing it and implement a fix for it which will be available in the next update for Viewer for Mac.
Please note that we've already updated Viewer for Mac/Linux and the latest version 1.0.10.q Beta 10 is available for download on this page. Please note that the licensing in the latest version works the same way as in Viewer for Windows, i.e. you can use Viewer for Mac/Linux in trial mode for 30 days after which you need to register your Viewer with your license key as described in this tutorial.