I've observed that applying a DropShadowEffect to a UIElement sporadically causes the UIElement's content to blur a bit. It's a pretty nasty effect: it can cause a photograph to look out of focus or worse- make an entire 'popup' region completely illegible.

I haven't seen anyone else complaining about this, so my inclination is to think that there is something that I am doing wrong.

Sample use (blurs content at random):

<Border>
   <Border.Effect>
      <DropShadowEffect />
   </Border.Effect>
   <!-- (Content) -->
</Border>

But removing the DropShadowEffect clears it up:

<Border>
    <!--<Border.Effect>
            <DropShadowEffect />
        </Border.Effect>-->
    <!-- (Content) -->
</Border>

Any ideas?

EDIT (added screenshot):

alt text http://signmgmt.com/eg/dropshadowblur.png

wpf styles dropshadow
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