If you see a warning message if you start Glade from the command line on Mac OS X of the form:
2012-12-08 14:13:43.040 glade[37831:707] *** WARNING: Method
userSpaceScaleFactor in class NSView is deprecated on 10.7 and later. It
should not be used in new applications. Use convertRectToBacking:
instead.
Don't worry, this should not cause any problems. I have submitted this bug to the Qt folks and already got a patch for it which is applied to the version of Qt used to build 4.3.25, and will be in subsequent Qt 4.8.x/5.0.