I can confirm that this error starts occurring after the latest update of W3 Total Cache and it seems to me that it only affects users with a configured CDN. I used the fix mentioned by @harrisanas above which resolved the issue for me. Hope this report helps to fix the error in the next update.
I decided to use Amazon CloutFront as my CDN. Everything seems to work. The only thing I don’t understand is where W3 Total Cache stores its static files. Can anyone help me? I want to take a look at what files are mirrored to the CDN. Thank you in advance.
I temporarily fixed this issue by replacing the definition of the following variable in the config.php file:
const linkedin_url_prefix = “http://www.linkedin.com/in/”;
to
const linkedin_url_prefix = “http://www.linkedin.com/”;
I would suggest this as a bugfix for the next version.