Symptoms
Virtual Machine List is greyed out and when trying to create new virtual machine, New option is also greyed out.
Cause
Graphical User Interface malfunction caused by OS X misconfiguration.
Resolution
- 
    
Open Finder, Go > Go To Folder >
~/Library/Preferences/ - 
    
Open com.parallels.Parallels Desktop.plist with Xcode

 - 
    
Right click on any space of Xcode window > Add Row

 - 
    
Add AppResumeDisabled, set type to Boolean and set Value as YES


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Save and restart Mac.
 - Start Parallels Desktop, New option and Virtual Machine list should now be available.
 
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