I tried ContrAlto on Mono on a Mac and it died almost immediately. The author said that there are some pretty serious bugs in the OS X version of Mono’s WinForm

I tried ContrAlto on Mono on a Mac and it died almost immediately. The author said that there are some pretty serious bugs in the OS X version of Mono’s WinForms support that break it, as well as a Mono bug that mangles keystroke mappings so the shift key doesn't work. He recommended I use Windows - ContrAlto worked without problems so I gave up on using Mono.