yeah, unfortunately the "support" for the development edition is very very lacking. I have actually had better luck in the Ubuntu forums. Here you are a tester more or less that sometimes warrants help. Best I can guess is you get good support with the paid edition only. I have been using this for two years and have had little to no help in this forum, again mostly had to piece together my own help through the Ubuntu forum. Decommissioning my server this weekend and moving to ClearOS, support has been great over in the community edition forums. Guess on that OS they see the potential of up selling the free edition to the paid by gaining your trust in the free edition. Here you can't even upgrade the free edition to paid if you wanted to, requires a complete re-install.
Best I can say is check the logs in /var/log through the shell and see if anything comes up related to this in the mail logs.