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Error: SelectedTab cannot be set before the pane has been added to a panes collection

Hi,

Each time I want to open a new document or a previously translated project, the error message appears: SelectedTab cannot be set before the pane has been added to a panes collection. (2 same messages).

I use Trados 2019 with Windows 10Pro

I have tried Reset Window Layout and SDL Freshstart.

I also reinstalled Trados, but no success.

Does anyone know how to fix it?

Regards,

Krzysztof

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