Unity patch releases are available here :
Fixed error messages when trying to recompile your scripts in Unity while the debugger is attached.Fixed “The request is not supported by the protocol version implemented by the debugee” when inspecting generic List/Dictionary.Fixed issue with MonoDevelop-Unity opening a new instance when clicking a script on Windows.Will be installed by the Unity editor installer for Unity 5.3. Fixed issue with being unable to set conditional breakpoints.Regression: MonoDevelop OSX must be installed in path without spaces.Fixed issue with MonoDevelop crashing on OSX.Included DocFood (/// documentation) and VersionControl add-ins.Fixed "The requested item has been unloaded" dialog when enabling/disabling breakpoints.Fixed "The requested item has been unloaded" when inspecting enums.Removed "Show Error Reference" and "API Documentation" menu items that launch the documentation browser, which we do not include nor support.
Might be required to install GTK# using GTKSharp/gtk-sharp.msi (Only once).Right click the zip file, select "Properties" and then click "Unblock".Copy MonoDevelop.app to a path without spaces on your disk.We are working on getting these fixes into Xamarin Studio. These builds are different from using Xamarin Studio 5.9 with the Unity Add-ins as they also contain fixes that are not yet included in Xamarin Studio. We are releasing preview builds of MonoDevelop-Unity 5.9, which will ship with Unity 5.3, for early testing and feedback. ATTENTION: Unity 5.3 with MonoDevelop-Unity 5.9 has been released.