Resolved BL2 savegame issues [rehashresign]

So, everytime I atempt to load a save file into the resigner it goes without a hitch... but when I've replaces all the IDs including the title ID and then click rehash and resign, it gives me this stupid message every time...

Spoiler

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Revolt.MainForm.(Object , EventArgs )
at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)
at System.Windows.Forms.MenuStrip.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.269 (RTMGDR.030319-2600)

----------------------------------------
360Revolution
Assembly Version: 2.71.0.0
Win32 Version: 2.71

----------------------------------------
Microsoft.VisualBasic
Assembly Version: 10.0.0.0
Win32 Version: 10.0.30319.1 built by: RTMRel

----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.269 built by: RTMGDR

----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.233 built by: RTMGDR

----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.269 built by: RTMGDR

----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.276 built by: RTMGDR

----------------------------------------
System.Runtime.Remoting
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

----------------------------------------
{e60be3da-4c28-4088-a420-dc439a52e068}
Assembly Version: 0.0.0.0
Win32 Version: 2.71

----------------------------------------
ForumConnect
Assembly Version: 1.0.0.0
Win32 Version: 2.71

----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.233 built by: RTMGDR

----------------------------------------
DevExpress.XtraBars.v11.2
Assembly Version: 11.2.7.0
Win32 Version: 2.71

----------------------------------------
DevExpress.Utils.v11.2
Assembly Version: 11.2.7.0
Win32 Version: 2.71

----------------------------------------
DevExpress.XtraEditors.v11.2
Assembly Version: 11.2.7.0
Win32 Version: 2.71

----------------------------------------
DevExpress.Data.v11.2
Assembly Version: 11.2.7.0
Win32 Version: 2.71

----------------------------------------
DevComponents.DotNetBar2
Assembly Version: 10.0.0.0
Win32 Version: 2.71

----------------------------------------
Accessibility
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel

----------------------------------------
System.Data
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.237 (RTMGDR.030319-2300)

----------------------------------------
Halo 3
Assembly Version: 1.0.0.0
Win32 Version: 2.71

----------------------------------------
System.Numerics
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel

----------------------------------------
XPG
Assembly Version: 1.0.0.0
Win32 Version: 2.71

----------------------------------------
PackageIO
Assembly Version: 0.1.9.2
Win32 Version: 2.71

----------------------------------------
Forza4Security
Assembly Version: 1.0.0.0
Win32 Version: 2.71

----------------------------------------
CLKsFATXLib
Assembly Version: 1.0.0.6
Win32 Version: 2.71

----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Is anyone able to help me out? I've managed to get it to work in the past... not sure why it has stopped now though.