Don't you also need to provide instruction on creating the yacoin.conf in order for yacoin to work in server mode?
Agreed. If you dont have the conf done right you will get an error at least....
Also the OPs command doesn't use -server switch but maunderingcabal includes it. Is the -server switch required to mine with a conf file or can you mine with it this switch and with no conf file? I've been spending a lot of time fiddling with settings and no coin.