Symptoms
Unable to open Windows start menu in Coherence mode
I am unable to open any Windows interface (start menu/taskbar) when Windows virtual machine is running in Coherence mode. When I click on Windows 'Start' button nothing shows up.
I already tried solution from KB #118611 Unable to open Windows start menu in Coherence mode
Cause
Incorrect permissions for ~/Library/Parallels folder
Resolution
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Shut down your Virtual Machine and quit Parallels Desktop
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Go to Finder Go menu > Go to Folder

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In the drop-down dialog type in:
~/Librarypress GO button
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You will be redirected into the hidden Library folder inside your home folder
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Locate Parallels folder and move it to Trash or rename it to something like Parallels-old
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Open your home folder and locate Applications and Applications (Parallels) folders.

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Delete all folders from inside Applications folder that relate to your Virtual Machine (for example: Windows 8 Applications folder)
WARNING: Make sure you do not delete Mac OS X system Applications folder!
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Delete the whole Applications (Parallels) folder
WARNING: Make sure you do not delete Mac OS X system Applications folder!
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Start Parallels Desktop and your Virtual Machine. Wait for a minute or two until all necessary folders and files are recreated.
 - Switch to Coherence mode and try to activate Start menu.
 
 
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