I've downloaded H3Mod latest version and installed .NET v1.1 (link from the H3Mod site). I just tried something simple by loading a 1.62 T10 firmware (jap & chs) and replacing the "Browser Background.gif" with a plain black .gif. When I go to save it gives me some error

... (See below)
In fact.. once loading any of the 1.62 firmwares (chs & kor) I can't save it and this error below pops up.
My pc is running Windows XP SP2 and has the latest Windows Updates.
************** Exception Text **************
System.IndexOutOfRan geException: Index was outside the bounds of the array.
at H3Mod.HxMem.CompareM emory(Byte[] pattern, Int32 patternOffset, Byte[] data, Int32 dataOffset, Int32 size)
at H3Mod.HxMem.Verify(H xFile firmware, Bookmarks marks, Boolean encrypted, Int32& errorOffset)
at H3Mod.HxFile.Save(Bo okmarks marks, String path)
at H3Mod.MainWindow.mnu FirmwareSave_Click(O bject sender, EventArgs e)
at System.Windows.Forms .MenuItem.OnClick(Ev entArgs e)
at System.Windows.Forms .MenuItemData.Execut e()
at System.Windows.Forms .Command.Invoke()
at System.Windows.Forms .Control.WmCommand(M essage& m)
at System.Windows.Forms .Control.WndProc(Mes sage& m)
at System.Windows.Forms .ScrollableControl.W ndProc(Message& m)
at System.Windows.Forms .ContainerControl.Wn dProc(Message& m)
at System.Windows.Forms .Form.WndProc(Messag e& m)
at System.Windows.Forms .ControlNativeWindow .OnMessage(Message& m)
at System.Windows.Forms .ControlNativeWindow .WndProc(Message& m)
at System.Windows.Forms .NativeWindow.Callba ck(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Loaded Assemblies **************
mscorlib
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.573
CodeBase: file:///c:/windows/microsoft.net/framework/v1.1.4322/mscorlib.dll
----------------------------------------
H3Mod
Assembly Version: 2.4.2248.33274
Win32 Version: 2.4.2248.33274
CodeBase: file:///C:/Documents%20and%20Se ttings/Robert%20Than/Desktop/H3Mod/H3Mod.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.573
CodeBase: file:///c:/windows/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c56 1934e089/system.windows.forms .dll
----------------------------------------
System
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.573
CodeBase: file:///c:/windows/assembly/gac/system/1.0.5000.0__b77a5c56 1934e089/system.dll
----------------------------------------
System.Drawing
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.573
CodeBase: file:///c:/windows/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f 11d50a3a/system.drawing.dll
----------------------------------------
System.Xml
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.573
CodeBase: file:///c:/windows/assembly/gac/system.xml/1.0.5000.0__b77a5c56 1934e089/system.xml.dll
----------------------------------------
************** JIT Debugging **************
To enable just in time (JIT) debugging, the config file for this
application or machine (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.form s jitDebugging="true" />
</configuration>