This will not be much help, but using this key receiver . . .
Public Sub key_KeyPressed (KeyCode As String) As Boolean
Log("Key received = " & KeyCode)
End Sub
. . . I get the Log message . . .
So there does not appear to be anything special about the Insert key.
The game view helper is declared as follows, but I am sure that you have done the same . . .
Private gvh As GameViewHelper
. . .
. . .
gvh.AddKeyListener("key", MainForm)