diff --git a/VECTO/GUI/F_Graph.vb b/VECTO/GUI/F_Graph.vb
index f9f3374dd408b2046f56e69ccdb89951c909b0af..923e092879c9cfb834c290661d108494465d57d5 100644
--- a/VECTO/GUI/F_Graph.vb
+++ b/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
diff --git a/VECTO/Input Files/cGBX.vb b/VECTO/Input Files/cGBX.vb
index b7c19677ed81801fff4752acb6d3712f924a1d3b..ef9867a8c9f98533b8edb77d318c2cf75489ecaf 100644
--- a/VECTO/Input Files/cGBX.vb	
+++ b/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