We did not encounter the above warning messages as you have mentioned. However there was some other warning message in the widgets section which has been fixed. We have sent an email with the plugin file as attachment and you need to use that on your server.
If you still get the error, then please add the following line to your wp-config.php file.
define('WP_DEBUG', false);
In case it’s already there and has value set as true, please change that to false.
Thanks