Remove the new yellow border ?
 

They added a yellow border to spells you cast on a mob, is there any way to remove it ?

Only change I see is in templates for WDT_InnerWhite where they added this:
<Border>
<TopLeft>A_InnerFrameTopLeft</TopLeft>
<Top>A_InnerFrameTop</Top>
<TopRight>A_InnerFrameTopRight</TopRight>
<RightTop>A_InnerFrameRight</RightTop>
<Right>A_InnerFrameRight</Right>
<RightBottom>A_InnerFrameRight</RightBottom>
<BottomRight>A_InnerFrameBottomRight</BottomRight>
<Bottom>A_InnerFrameBottom</Bottom>
<BottomLeft>A_InnerFrameBottomLeft</BottomLeft>
<LeftTop>A_InnerFrameLeft</LeftTop>
<Left>A_InnerFrameLeft</Left>
<LeftBottom>A_InnerFrameLeft</LeftBottom>
<OverlapLeft>0</OverlapLeft>
<OverlapTop>0</OverlapTop>
<OverlapRight>0</OverlapRight>
<OverlapBottom>0</OverlapBottom>
</Border>

currently no, least i haven't found any way of doing it so it might be HC.