Gtk# references "disappear" when switching to Mono runtime in Monodevelop

I installed the following on my Windows 7 PC in the following order with no issues: 1.) Mono for Windows 2.10.5 2.) Gtk# for .Net 2.12.10 3.) Monodevelop 2.6 RC1

I made a simple test Gtk app (targeting .NET 3.5) to verify my new installation, and I noticed the following wierd behavior:

When I target the default runtime (Microsoft .NET), everything works fine.

However, when I change the target runtime to Mono,

all of my Gtk# references disappear, as shown in the next image.

All of the references highlighted in red in image #3 have the 开发者_Go百科same error message as the one I expanded for atk-sharp - "Assembly not available for Mono/.Net 3.5"

When I tried to correct the references using "Edit References", none of the Gtk# assemblies show up in the list of Packages when the runtime is Mono (remember, everything's fine when I target the default .NET). If I try to add the assemblies manually through the "Edit References" -> ".Net Assembly" dialog, I get a warning about losing my Stetic, then my UI gets blown away and the program will not compile/build anymore.

I tried changing my target runtime to .NET 4.0, 3.0, and 2.0, and that didn't make an ounce of difference:

I don't pretend to be an expert in the Mono world - is this a known issue? Did I miss a configuration step in my installation, perhaps? Thanks in advance - I'm stuck!

You might be encountering this bug: http://bugzilla.xamarin.com/show_bug.cgi?id=552