Unity’s MonoDevelop Won’t Start on OSX

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I ran into this problem the first time that I installed Unity, and I just encountered it again after upgrading to Unity 4.3. When I launch the IDE the MonoDevelop logo shows briefly in the dock before disappearing but MonoDevelop doesn’t start.
Here’s a little detail on my setup:
  • Mac OSX 10.9
  • I generally run as a non-admin user.
  • Unity 4.3, MonoDevelop-Unity 4.0.1
The problem seems related to running as a non-admin user on my mac and MonoDevelop doesn’t seem to like this. Here’s the workaround that solved the problem for me:
  1. Move the MonoDevelop app from the default location in your applications directory to a directory where your user has write permissions. For example, mine goes in ~/Applications.
  2. In Unity, select Preferences > External Tools > External Script Editor.
  3. Choose Browse… and select the path where you put MonoDevelop in step 1. Make sure that this is set as the external editor in Preferences.
Selecting an External Editor
Unity Monodevelop Editor
Now when you click on a script, Unity will launch MonoDevelop from the new location, and it seems to be happy with the write permissions. If I get some time over the weekend I may try figuring out what exactly the problem is so I can submit it.

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