Hardware Overview:

Model Name: iMac
Model Identifier: iMac12,2
Processor Name: Intel Core i5
Processor Speed: 3.1 GHz
Memory: 12 GB
Boot ROM Version: IM121.0047.B1F
SMC Version (system): 1.72f5

Installed latest Zimbra Desktop Client (7.2.2)
First Error:
Unresponsive Script:
A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: file:///Applications/Zimbra%20Desktop/macos/prism/Prism.app/Contents/Resources/modules/WebAppProperties.jsm:190
Second Error:
Couldn't access Zimbra Desktop server.  If issue persists after reinstall, please check logs for errors and report to http://www.zimbra.com/forums/zimbra-desktop.
Then ZDC quits.