UPDATE: We have now successfully tested MediaShout for Mac with the Mavericks update and have about 95% success on the tested systems. However, there are a few things you will need to do to make MediaShout work. Please follow the instructions below to make sure you are setup correctly. If you have any additional issues, please contact our support team.
NOTE: We have seen some issues with PowerPoint and Keynote in Mavericks that doesn't allow for playing in MediaShout. The best resolution for those situations is to have the presentation open up separately and have it displayed on your other screen. Then open MediaShout so that it is on top of your PowerPoint/Keynote on the second screen. Using the Command+1 key combination will turn off the MediaShout screen and allow you to advance your presentation on the second screen. When you reach the end of your presentation, simply click on MediaShout to bring focus back and hit Command+1 to bring MediaShout back on the second screen.
1) Open up your Apple->System Preferences->Mission Control and uncheck "Displays have separate spaces." This will allow MediaShout to show the output on the second screen. Please note, you will need to log out and log back in for this change to take effect.
2) If you are using a USB to DVI adapter for video playback, please update your drivers from DisplayLink to the latest version. These drivers are updated to work with Mavericks.
There may be some additional (although rare) issues that you may come across, so if you have any questions, please contact us.