Trados 2015 will not open

Trados 2015 was working fine until yesterday.
Today when I try to open it, it is not visible.
If I try to toggle between applications (Alt key and Tab), I see a "ghost" mini Trados window, but it will not toggle open.
Updated to latest version of 2015, restarted PC, etc., but same result.
Hope you can suggest what action to take.
Cheers.

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