Hi,
I use a fresh install of dokku master post v0.3.12, 2015-01-05 19:58 566cc15

cd myapp
git remote add deploy dokku@wholphin:myapp
git push deploy master

myapp.example.com is accessible, the generated nginx.conf contains
upstream myapp { server 172.17.0.52:5000; }
all good.

Now if I add a domain
ssh dokku@wholphin domains:add myapp wwww.myapp.example.com
The application is inaccessible because I have this in the generated nginx.conf:
upstream myapp { server 127.0.0.1:5000; }