[support] Dynamic display block

[Roger]

  I have dd_block working well in the content block, the footer block 
and even the sidebars but it will not display in the header block
I'm using unaltrered Marinelli theme and have commented out the link to 
the default image
I'm puzzled.

I can't find any reference to the dd_block in the links, style, layout, 
or graphics css files
Can someone tell me what I should be looking for to correct the problem?

Many thanks
Roger