[Plugin: Shadowbox JS] W3 Total Cache, MaxCDN & Shadowbox JS not working

I’ve read all the threads I could find regarding using Shadowbox with W3TC and a cdn, and tried every solution suggested without success. I’m using W3TC with MaxCDN (it’s pull, not push). I’ve methodically tried every combination of delivering Shadowbox’s files and cache files from either the web server or cdn. I’ve purged all caches prior to every deployment. I’ve tried disabling Shadowbox’s cache altogether so that it doesn’t need wp-content/uploads/shadowbox-js/ (and nothing from shadowbox is running on the cdn at all – all its files delvered from the main server). I’ve tried everything I could think of, spent all of yesterday on it, and am completely stuck. If anyone can advise, that would be great.