Error message : SelectedTab Cannot be Set Before the Pane Has Been Added to a Panes Collection

Hello !

I have Trados Studio 2014 and have today this error message "SelectedTab Cannot be Set Before the Pane Has Been Added to a Panes Collection" when changing segment. 

I try to repair SDL Trados on the panel control of my computer and to click on "reset window layout" on Trados but nothing works.

Do you have a solution for me?

Thank you very much 

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