[MonoDevelop] Exception in OverrideImplementsDialog

[Casey Marshall]

I've been getting this exception when trying to use the 
override/implement members dialog:

> System.NullReferenceException: Object reference not set to an instance of an object
>   at MonoDevelop.Ide.OverridesImplementsDialog.GetChecked (TreeIter iter) [0x00000] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OverridesImplementsDialog.cs:296 
>   at MonoDevelop.Ide.OverridesImplementsDialog+<GetCheckedSiblings>c__Iterator1.MoveNext () [0x00032] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OverridesImplementsDialog.cs:270 
>   at MonoDevelop.Ide.OverridesImplementsDialog+<YieldImpls>c__Iterator2.MoveNext () [0x000ee] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OverridesImplementsDialog.cs:280 
>   at CSharpBinding.Parser.CSharpRefactorer+<FixGenericImpl>c__Iterator0.MoveNext () [0x0010b] in /home/cmarshall/Source/monodevelop/main/src/addins/CSharpBinding/Parser/CodeGenerator.cs:190 
>   at MonoDevelop.Projects.CodeGeneration.BaseRefactorer+<YieldImpls>c__Iterator0.MoveNext () [0x0009a] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/BaseRefactorer.cs:273 
>   at MonoDevelop.Projects.CodeGeneration.BaseRefactorer.AddMembers (MonoDevelop.Projects.CodeGeneration.RefactorerContext ctx, IClass cls, IEnumerable`1 members) [0x0001d] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/BaseRefactorer.cs:126 
>   at MonoDevelop.Projects.CodeGeneration.BaseRefactorer.AddMembers (MonoDevelop.Projects.CodeGeneration.RefactorerContext ctx, IClass cls, IEnumerable`1 members, System.String foldingRegionName) [0x0000c] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/BaseRefactorer.cs:135 
>   at MonoDevelop.Projects.CodeGeneration.BaseRefactorer.ImplementMembers (MonoDevelop.Projects.CodeGeneration.RefactorerContext ctx, IClass cls, IEnumerable`1 members, System.String foldingRegionName) [0x00000] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/BaseRefactorer.cs:265 
>   at CSharpBinding.Parser.CSharpRefactorer.ImplementMembers (MonoDevelop.Projects.CodeGeneration.RefactorerContext ctx, IClass cls, IEnumerable`1 members, System.String foldingRegionName) [0x00000] in /home/cmarshall/Source/monodevelop/main/src/addins/CSharpBinding/Parser/CodeGenerator.cs:183 
>   at MonoDevelop.Projects.CodeGeneration.CodeRefactorer.ImplementMembers (IClass cls, IEnumerable`1 members, System.String foldingRegionName) [0x00010] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/CodeRefactorer.cs:293 
>   at MonoDevelop.Ide.OverridesImplementsDialog.OnOKClicked (System.Object sender, System.EventArgs e) [0x0001f] in /home/cmarshall/Source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OverridesImplementsDialog.cs:237 
>   at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr data) [0x00000] 

Is this a known issue? Is my (GTK#/Gnome#?) install busted?

I've been getting this for quite a while now, tracking the SVN sources.

Thanks.