One cause of Silverlight's White Screen of Death (WSOD)

We have this silverlight (4.0) website that would work for most, but a select few were only seeing a white screen. I tried running the website in different IE formats and even in firefox. The results were the same no matter what browsers were used. So we narrowed it down to something with the machine.

A white screen usually means that there is a silverlight error, which can be tough to trace/track down. In our case it came down to the issue that nested user controls cannot have static resources. Don't know how this applies to the machine level is beyond my comprehension.

So instead of this:
 <usercontrol.resources>
  <style targettype="sdk:DataGridColumnHeader" x:key="DataGridHeader">
      <setter Property="FontSize" Value="10"/>
      <setter Property="Padding" Value="3"/>
      <setter Property="Margin" Value="0"/>
 </style>
</usercontrol.resources>

We needed to put the style more inline:
<sdk:datagrid.columnheaderstyle>
   <style targettype="sdk:DataGridColumnHeader">
      <setter Property="FontSize" Value="10"/>
      <setter Property="Padding" Value="3"/>
      <setter Property="Margin" Value="0"/>
 </style>
</sdk:datagrid.columnheaderstyle>