We have been using OE 9.3A since January and have version 180410 now. On a small peer-to-peer Windows 10 network, this is not happening on any of our computers and we can multi-select rows on the grid. We have a variety of wired USB mice and no unusual settings in Windows Mouse settings except our double-click speed is set at the slowest setting.

Rick McLeod
Sunbeam Specialties, Inc.