We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#1892 - Welcome Emails show html codes rather than formatted
It was not supporting HTML NEWSLETTER_DEFAULT_FCOMCODE templates (welcome mails use that too, but newsletters are supposed to allow it to be in either HTML or Comcode format). I have fixed that.
You may want to remove the salutation and footer from your welcome mails, given the template also includes this.
Oh. and if you want to test, I left some test code in your data_custom/execute_temp.php, just change the email from mine to yours, and it will send all welcome emails to you for you to preview.
You may want to remove the salutation and footer from your welcome mails, given the template also includes this.