I'm re-posting this directly as it appeared on the Xbench forum, as it may be of interest for all those who use Studio and the Xbench Studio plug-in:
With SDL Trados Studio 2017 Cumulative Update 9 (CU9) the Xbench Edit Segment (Ctrl+E) feature may stop working (it does not open the Studio document).
To be able to use the Edit Segment functionality after you updated your Trados Studio 2017 to CU9, just download and install the latest Xbench plugin for Studio (build 13)