Domain Mapping not referencing full url for assets

Version 4.2 seems to work fine, however, >= 4.3 result in almost all of the assets returning 404 due to improper urls.

http://source.purpo.se/ is an example. It works perfectly on subdomains (https://source.law.fm works fine) but the mapped domain breaks.

Any ideas on what the issue might be?

http://etc.bz/amVQ/2015-04-25%20at%2011.55%20PM.png