Has anyone got Ardour 2.4 up and running using X11 in leopard? Everything was working fine on tiger (before the upgrade). I guess the X11 that ships with leopard is somewhat broken.
In short: what X11 version are you using to run Ardour 2.4 in leopard?
You need to upgrade using the releases from http://xquartz.macosforge.org/
What Apple giveth, Apple taketh away. They finally installed X11 by default when they released Leopard. But they installed a broken X11.
Remember that native (X11-free) versions are referenced in our OS X IRC channel.