The errata thread is where we store the errata. The only serious issues with CW is that the maps got rotated (in post-production, incidentally, so after the playtests) and that we forgot to include an entrance to level 6B, which was a miscommunication between my co-author and myself.
I've updated the errata link to specifically refer to a thread that discusses a secret door on level 1 and the map rotation.
As far as customer support goes, if you have a specific question, just ask it here at the forum or feel free to PM me. I generally check this board several times a day (mostly checking for spam), and I'd be happy to answer any questions I am able.
Understood about the frustration. Your original point was valid (you buy these to make your life a bit easier). I think, rather I hope, that once you rotate the maps you'll find CW is a pretty cool adventure-path-in-a-box (or PDF, as it were).
Co-Author: The Almanac of the Endless Traders, DCC #13, DCC #29, DCC #49, DCC #51, DCC #52, DCC #63
Author: DCC #55: Isle of the Sea Drake, DCC #61: Citadel of the Corruptor, more to come....