Using the OpenNX client in Yosemite

This seems to be a can of worms. To summarise, for reasons that no-one seems to have been able to figure, there seem to be two different situations:

1. Many users are able to use Florian's fix, namely to install nxproxy from MacPorts, and then to move aside the nxproxy that OpenNX client installs, and instead put a symlink from there to the MacPorts one
2. Other users (including me) can't get this to work. Instead, we have to revert to an earlier version of XQuartz (2.7.5). Using this, you get a fairly unsatisfactory but working setup. The client window takes up the whole of the screen (or screens if you have more than one), and it doesn't have a top bar (so you can't close it, you have to quite XQuartz). Once you put any other window in front of it, you can't get the focus back to it. Etc. But it kind-of works. However apart from complications with keyboard mappings, x2go may be a better bet.