I have the same problem – latest version of Chrome on a 15″ Retina MacBook Pro. Is fine in Safari. Might be the number of items in the portfolio – ones with 12 don’t load, but with only four do.
Thanks for your really helpful response. Looking at your PHP code, there seems to be no way to configure SMTP settings, so I wonder how this is supposed to work for most people. Please can you give me some proper support, or release an update that allows you to configure your SMTP settings in Theme Options, or just use WP SMTP settings like every other theme does.