the latest versions has an issue with the block inner divs IDs. When setting more than one ad in a block/group it's is generating a code, something like "div id="1 2"", wich is invalid according to w3c best practices.
i've made a tiny change at line 282 in adrotate-output.php
" $output .= '<div id="'.$j.'_'.$banner_id.'"class="block_inner a-'.$block->id; "
pls have a look. cheers!
