The best places to get help are the DCP-o-matic mailing list or forum. They are read by many experienced users of DCP-o-matic (including film-makers, projectionists and cinema technicians) and myself. You do not have to be a member of the mailing list to post to it (though I have to approve your message so don't be alarmed if it does not appear straight away).
You might like to read a short discussion of reasonable expectations for DCP-o-matic.
If you find a bug in DCP-o-matic please update to the latest test version before reporting it, as there is a good chance that the bug is already fixed.
If you want to discuss something privately please feel free to email me (Carl) directly. Be aware, though, that you will probably get a quicker response from the mailing list as I often get more email about DCP-o-matic than I can answer in a day.