MonoDevelop won't load

Question

I have a Raspberry Pi running Wheezy on 4gb memory card. I installed Mono and MonoDevelop by running

sudo apt-get update
sudo apt-get mono-complete
sudo apt-get monodevelop

Yet now whenever I run MonoDevelop the splash screen displays and then I get the following error message:

System.NullReferenceException: Object reference not set to an instance of an object
   at MonoDevelop.Ide.IdePreferences.get_DefaultTargetRuntime () [0x00000] in <filename unknown>:0 
   at MonoDevelop.Ide.RootWorkspace.set_UseDefaultRuntime (Boolean value) [0x00000] in <filename unknown>:0 
   at MonoDevelop.Ide.RootWorkspace..ctor () [0x00000] in <filename unknown>:0 
   at MonoDevelop.Ide.IdeApp.Initialize (IProgressMonitor monitor) [0x00000] in <filename unknown>:0 
   at MonoDevelop.Ide.IdeStartup.Run (MonoDevelop.Ide.MonoDevelopOptions options) [0x00000] in <filename unknown>:0 

What have I done wrong?

I've tried compiling various programs as suggested by http://www.mono-project.com/Mono_Basics but all of the scripts (apart from the first) do not work at all.