Strange "white square" in Review mode that can not be removed

Hi everybody,

After reinstallation of Trados Studio 2017, this strange "white square" appears in Review mode that can not be removed. It partly covers the top window with the Translation and Concordance Results:

I tried resetting the window layout and also checked via Alt-Tab whether it's a window that I could possibly close, but it's not in the list:

Has anybody experienced a similar thing and can help me with a solution?

Any ideas very much appreciated.



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