We have recently discovered some odd behavior with the newest Mac Client download. We are currently working to resolve this issue and in the meantime you can use the easy workaround to get 3DPrinterOS up and running on your Mac.
STEP 1: Navigate to the applications tab in your finder, right click on the 3DPrinterOS application, and select "Show Package Contents"
STEP 2: Now select "Contents" then select "Resources"
STEP 3: From the Resources folder select and open "launcher".
STEP 4: The "launcher" window will open and the 3DPrinterOS application should start normally. NOTE: YOU MUST LEAVE THE LAUNCHER WINDOW OPEN OR THE 3DPRINTEROS APPLICATION WILL SHUT OFF AGAIN.
We apologize in advance for any inconvenience this may cause and we are working hard to get it fixed ASAP. We will close this topic and inform everyone as soon as this is resolved.