I’m having this issue where when I attempt to debug some code using Monodevelop I consistently get a hang when attempting to attach to the unity process. I have gotten it to work once or twice, but in general it pretty much never works. Coworkers have no issues debugging the same project on both PC and Mac, so I don’t think it’s an issue with my project. Repro steps: Launch Unity Launch Monodevelop In Monodevelop Run->Attach To Process Clicking attach to process will cause the hang. Sometimes though clicking anything causes a spinning beach ball hang, and sometimes just doing nothing and clicking the window will cause a hang. My setup: Macbook Air running Mavericks (10.9) Non-pro Unity 4.3.0f4 (though I had the same issue running 4.2 and 4.3 beta) MonoDevelop 4.0.1 Things that may be unique about my setup: I occasionally write code in Sublime Text 2, making use of the CompleteSharp plugin which I believe runs a mono process. The issue occurs whether I have Sublime Text open or not. My project lives on an external HD. The only time I have ever gotten debugging to work was when I moved my project to my computer’s local drive, and so I thought that fixed the issue, but since then I’ve still been getting the same issue whether the project is on local storage or external.