The bar ad works in preview mode on adplugg but doesn't work on my site. It only shows the image and part of the text and dosen't go all the way across the page. Why is that?
It is probably because your Ad Tag is inside of another element (such as a div) and is being constrained within that element. On our demo, we added an AdPlugg Zone tag right below the opening <body> tag. This allows the bar ad to use the whole page. You can view the source of the demo to see it but here is an excerpt of what it would approximately look like:
... <body> <div class="adplugg-tag" data-adplugg-zone="utility"></div> ...
Then in our AdPlugg configuration we created a Zone called "Utility". Lastly we targeted the bar ad to the Utiltity zone (we did it via a Placement but that isn't required).
That should do it. If not, you can use our Contact form to send us the site and we'll take a look.