Let me start by saying that I've never found an online newsletter platform that's both complete AND easy to use the same way that JINC is -- and I've looked everywhere (Drupal, Wordpress, stand-alone, etc.). So congratulations!
The bug I found is related to loading message templates when composing new messages. So far, I've only found this problem when using JCE (works fine with TinyMCE, but I prefer to use JCE). When loading the template, the template body does not load within the body area. When the rich text is turned on, it just populates the field with "response.body", and when the rich text is turned off, nothing shows up.
I've tried this with JCE 2.0.1 - 2.0.3, but the bug persists on each one. Also, I'm using JINC 0.8.2. Any help you could offer would be greatly appreciated!