1.1 --- a/Hardware/Computer.cs	Tue Mar 15 22:00:31 2011 +0000
     1.2 +++ b/Hardware/Computer.cs	Wed Mar 16 22:10:26 2011 +0000
     1.3 @@ -268,9 +268,11 @@
     1.4        if (!open)
     1.5          return;
     1.6  
     1.7 -      foreach (IGroup group in groups)
     1.8 -        group.Close();
     1.9 -      groups.Clear();
    1.10 +      while (groups.Count > 0) {
    1.11 +        IGroup group = groups[groups.Count - 1];
    1.12 +        Remove(group);
    1.13 +        group.Close(); 
    1.14 +      } 
    1.15  
    1.16        Opcode.Close();
    1.17        Ring0.Close();