Navigating with cursor keys up and down an TAdvStringGrid with MouseActions.DisjunctRowSelect property set to True results in flickering of arbitrary grid cells and is slower than with grid's MouseActions.DisjunctRowSelect set to False. Flickering is observed best while pressing up key in top grid row or while pressing down key in last row. We are using TMS VCL UI Pack 10.6.2.0 and Delphi 11.0 Alexandria. Sample program and source code can be provided.
Immediately solution: set grid.DoubleBuffered = true