Hi owen your plugin has a conflict With a SB welcome plugin.
i posted a few month ago this thread:
I really need your plugin... In fact I think this is the only plugin that make this here in wordpress repository! BIG thankyou for creating this, but I do really need SB Welcome Email Editor too because of my membership site. Could you take a look at this issue please?.
When I activate your plugin SB Welcome Email Editor is not sending any email edited, when I deactivate it th SB Welcome Email Editor works fine... Could you fix this issue?
Please let me know Owen.