Warning: Invalid argument supplied for foreach() in /home/../public_html/wp-content/plugins/adrotate/adrotate-functions.php on line 425
It happened with all blogs where I’ve recently updated Adrotate plugin. If you navigate away from the plugin page this warning will disappear and will not appear again.
This seems to be just a warning and doesn’t actually affect the plugin or blog. The AdRotate seems to work fine. See the right column top banners, refresh the page CTRL+F5 and you will see banners rotating. The AdRotate settings page also seem to work fine.
So ignore this warning and move on.