Hi Alex. I wanted to confirm with Andrew that I have also had issues. I do have a Ticket ID that I will reply to now. The last checkin from mxHero was 10/03/2013 on that ticket. So I am still waiting patiently for resolution. 

I still have not been successful to send a single email using MxHero. They sit in my drafts. I go to Drafts and send from there. Consistently I get the message:

mxHero usually moves your message to Draft folder in order to send it, but we cannot access your email.

To allow us to send it properly please follow these steps:

1. Go to your Draft Gmail folder.
2. Open the message you want to send.
3. Make a little change inside email's content.
4. Select mxHero Apps that you want this email to be applied.
5. Click the Send mxHero Button.