Blocks of unchanged color after background color change FOUND PROBLEM

The drop shadow was repeating. The transparent part of the shadow was taking on the background color and because the background color was the same as the shadow, it created what looked like a solid block. It was only when I changed the background color I could see bands (ie shadow and bkgrd repeated). Tried no-repeat in css but didn't work. Problem solved by removing drop shadow param.

I changed the background color but there are blocks of black still there - not sure if its the background (I know the horizontal lines are definitely the body color)or what. I've tried coloring every table, body and divs in most of the files that look relevant but nothing seems to change the black blocks.

Any suggestions gratefully accepted