I was using Code Blocks 10.05 under OSX 10.7x and it appears wxFontDialog and wxColourDialog do not display a GUI in my application (wxWidgets built with OSX 10.6 SDK). I switched over to the latest and greatest XCode building with the OSX 10.6 SDK and the bug does not exist, both wxFontDialog and wxColourDialog yield visible and operable GUIs. I am sticking to native IDEs for wxWidgets development until this issue can be addressed...I could have mis-configured my Code Blocks workspace, it is very possible. However, I used it's settings as a template for my XCode workspace that yields good results. wxWidgets is built for 32 bit as is my application.