Answers below, in BOLD:
Clean install or install on top of existing install?
Exiting install, upgraded from OSX Mavericks.
XQuartz installed?
Reinstalled XQuarts this morning, latest version 2.7.7
Xserver running?
I believe so, is there a command I can run to confirm this?
Did an xhost + on Mac to allow access?
Yes, I ran the above command.
I tried removing XQuarts, and reinstalling, unfortunately I got the same result. I also disabled my firewall completely. If you need any additional information, please let me know. Thanks!
--Asif