Sorry Mike, actually topic not solved so I wonder if you could take a look?
As a test I published both top_row2_1 top_row2_2 modules on the homepage and they did stack side-by-side, so that is not an issue, BUT they used 1 single image which is the one set at template's config to display on top_row2_2
The issue is that I have two modules;
1) TIMELINE - position = top_row2_1, menu assignment = home, template background Top Row2 Area1= wolterart_toprow_ny
2) EXHIBITIONS - position top_row2_2, menu assignment = exhibitions, template background Top Row2 Area2= wolterart_toprow_uk
Module 2 is fine and displaying the correct image but the module 1 TIMELINE is displaying the image set for Top Row2 Area2. I can see this happening with Firebug but don't understand why or how to fix it.