Error Message "SelectedTab Cannot be Set Before the Pane Has Been Added to a Panes Collection" when changing segment.

Question

Hi members, 
 I have an error message each time I try to change the segment and it says 'SelectedTab Cannot be Set Before the Pane Has Been Added to a Panes Collection'. 
 I repaired the installation segments at the Control Panel, and updates have been made. However, I'm still receiving the same error message and it's disturbing my work, as it's shown each time I try to change the segment or go back to the used one. 
 Kindly assist. 
 Big thanks! 
 Maja Komilija

Paul · Answer

Hi Maja KOMILIJA , 
 
Can you try a reset? You didn't mention the version you are using so based on Studio 2017 rename this folder (just add _old to the end or something, it's not important what you rename it to) and restart Studio: 
 
c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14.0.0.0

Trados Studio > 1. Trados Studio

Error Message "SelectedTab Cannot be Set Before the Pane Has Been Added to a Panes Collection" when changing segment.