Problem With AddToAny Upgrade on WordPress

I’ve seen a few problems with upgrading to the current version of the AddToAny plugin in WordPress.   On most sites the upgrade has worked fine, but on two I’ve received the dreaded cannot modify headers message: Warning: Cannot modify header information – headers already sent by (output started at  . . ./wp-content/plugins/add-to-any/services.php:2) in . . […]