There should be no conflict with Smart Backgrounds. They should work together providing you put the code in the right spots.

I went to your site and the tracking is not showing. I have not used the Smart Backgrounds mod, but if it alters the Footer in any way, that might be your problem. I have seen with affiliate programs where the footer override causes the code not to show and correction of this is an easy fix.

In your case it may be that as well (again, never used the Smart Pages mod but this would likely be true if the footer file was altered.)

The other thing you might want to check is if you completed step 3 of the install read me. There is some code that needs to be pasted into the tpl_main_page.php file in order for the Google tracking to be added to the site.

Let me know if any of this helps or not and we'll work through it to make sure it is working for you.