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Trados Studio 2015 application disappeared from the PC screen.

I am using Trados Studio 2015 on Windows 8.1.

When I was editing translation, the whole application disappeared from the display. It seems that the application moved outside of the display range. I can see it open on the task bar but cannot bring it back to the screen. Re-starting did not fix the problem.

I checked the property of the short-cut icon and confirmed that the setting was to open as a normal screen.

Can someone tell me how I can fix this problem?