All tests pass now. The bug that I found in the Mono VB compiler has …

…been fixed by the Mono VB team, but it will not be backported due to some major changes. Since we will target Mono 2.6.5, we have to use a work around. The next major version of Mono will include the bug fix. Here's a link to the discussion: http://mono.1490590.n4.nabble.com/Using-reflection-to-invoke-a-method-written-in-VB-throws-an-exception-tp2236684p2252498.html

Tests/FeatureTests/ExternalSteps/ExternalStepsVB/VBSteps.vb

@@ -5,12 +5,12 @@ Public Class VBStepDefinitions
 
     <Given("I have external step definitions in a separate assembly referenced by this project")> _
     Public Sub step1()
-        ScenarioContext.Current.Item("counter") = 1
+        ScenarioContext.Current("counter") = 1
     End Sub
 
     <[When]("I call those steps")> _
     Public Sub step2()
-        ScenarioContext.Current.Item("counter") += 1
+    	ScenarioContext.Current("counter") += 1
     End Sub
 
 End Class