2.2rc1: Graphic scaling problem

[F M Salter]

    After introducing an oversized graphic png image, attempts to set
the scaling fail!
LyX appears set the scaling, when OK is pressed but fails to complete
this action  -- the scale is left unset
    After using a text editor to insert i"width 100text%" for the image,
LyX will work as intended and subsequently adjust the width to whatever
is required.
     Only the initial setting fails.
Regards
Frank Salter