We have Trados studio 2017 - CU12 and we've encountered a bug in the upper part of the editor:
Every time we try to open a file for translation, revision or sign off, the left part of the pannel gets frozen and it cannot be closed, so it is difficult to see what is behind it. We have tried to reset window layout and play with the different options in the "View" tab, but it is not fixed.
Setting to "Not Considering" - but htis just means not considering as an idea. We should still fix the bug once it's moved and reported to us. Paul FYI.