proxy.conf src_ipaddr ignored

I've a strange problem with proxying working perfectly in debugging mode, but not in production mode. I tracked this down to the src_ipaddr setting in proxy.conf apperantly being ignored depending on command-line options. Option settings that do work include: -sfxx -l stdout -sfx -l stdout Option settings that don't work include: -sf -l stdout -sfxx Is this a known issue in 2.1.7? Am I going mad? I found that the other issue I ran into (server not starting up properly if multiple home server sections included a src_ipaddr setting) was fixed in 2.1.10, but I couldn't find anything about the issue I'm facing now.