Coherence option disappeared; can't open apps on mac taskbar

Olivia2

Bit poster
I've Parallels 11.1.2 and Windows 10 Pro on my Macbook Pro OSX El Capitan v10.11.1.
A few days ago the windows-based applications in the mac taskbar simply would not open whilst in coherence mode.
I then exited coherence mode because the only way I could open up those applications was using full screen through the windows desktop or start menu.
I have since tried removing the parallels tools & reinstalling (and a few other things); however, now the option for coherence is greyed out and not available.
When I click on the icons in the taskbar, a question mark shows up over themupload_2016-2-18_22-58-48.png. I can still open the applications through using full screen through the windows desktop or start menu, however.
How can I get coherence mode functioning again, as well as being able to open up the windows applications via the mac taskbar?
 
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