For those interested in. I've just installed 2.10.6 and it works. MonoDevelop now opens correctly. -- View this message in context: http://mono.1490590.n4.nabble.com/Mono-2-10-5-MonoDevelop-crashes-with-exit-code-255-tp3854641p3909529.html Sent from the Mono - OSX mailing list archive at Nabble.com.