Hi Daid,
tried you beta version on OS X 10.10 (Yosemite) and ... the program stop with an error message, so ... started Cura (Applications/Cura 14.11/Cura.app/Contents/MacOS/Cura) inside the terminal and this is what I have :
Guglielmos-iMac-27:~ gpb01$ /Applications/Cura\ 14.11/Cura.app/Contents/MacOS/Cura load preferences from /Users/gpb01/Library/Application Support/Cura/14.11-RC7/preferences.ini 2014-11-06 17:03:49.460 Cura[5125:168959] GLUT Warning: glutInit being called a second time. Traceback (most recent call last): File "/Applications/Cura 14.11/Cura.app/Contents/Resources/__boot__.py", line 316, in <module> _run() File "/Applications/Cura 14.11/Cura.app/Contents/Resources/__boot__.py", line 311, in _run exec(compile(source, path, 'exec'), globals(), globals()) File "/Applications/Cura 14.11/Cura.app/Contents/Resources/cura.py", line 89, in <module> main() File "/Applications/Cura 14.11/Cura.app/Contents/Resources/cura.py", line 86, in main app.CuraApp(args).MainLoop() File "Cura/gui/app.pyo", line 58, in __init__ File "Cura/gui/app.pyo", line 100, in afterSplashCallback File "Cura/gui/mainWindow.pyo", line 28, in <module> ImportError: No module named pubsub 2014-11-06 17:03:49.555 Cura[5125:168959] Cura Error 2014-11-06 17:03:49.563 Cura[5125:168959] ApplePersistence=NO Guglielmos-iMac-27:~ gpb01$
I don't know if this can help ...
Guglielmo