* Bugfix: Error in TC Iteration caused crash

* Bugfix: Minimizing Graph window caused crash

VECTO/GUI/F_Graph.vb

@@ -169,6 +169,8 @@ Public Class F_Graph
         Dim i As Integer
         Dim img As Image
 
+        If Me.WindowState = FormWindowState.Minimized Then Exit Sub
+
         If Me.ListView1.CheckedItems.Count = 0 Then
             Me.PictureBox1.Image = Nothing
             Exit Sub

VECTO/Input Files/cGBX.vb

@@ -477,7 +477,7 @@ Public Class cGBX
         End If
 
         'Reduce step size if nu-range is too low
-        Do While (nuMax - nuMin) / nuStep < 10
+        Do While (nuMax - nuMin) / nuStep < 10 And nuStep > 0.00001
             nuStep *= 0.1
         Loop