error message "cannot set the active view to a view that is disabled or not available"

Whatever I try to do, first I get error message "cannot set the active view to a view that is disabled or not available". Next the ribbon disappears and I get the next error message: "Failed to activate view editor". I cannot even close the window but another Trados window opens without problems. Does anyone know what might be the problem and how to avoid it? And how do I close the window with no  drop-down menu nor ribbon? I have installed Studio 2015 version a week ago. Thanks!

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