In a worksheet named "GUI" I have a drop-down in cell "B15". What I need to
do is as the end user makes a selection change in this drop-down, it runs a
macro to recalculate.

I am using the code below in the "GUI" worksheet:

Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "B15" Then
Call SideFundSolve
End If
End Sub

The behavior I'm getting as I watch it in the debugger is it just skips over
the Call. What am I doing wrong?