MPEI throws null reference exception (1 Viewer)

[CodeMonkey]

MediaPortal Version: 1.1 RC1
MediaPortal Skin:
Windows Version: 7 Pro
CPU Type:
HDD:
Memory:
Motherboard:
Video Card:
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

Every time I try to install anything with the MPEI installer (the most recent example is the Fidelty skin) it throws a null reference exception. Log zip file attached.

 

[dukus]

You can post a screenshot ? The installer don't make any log ...

 

[CodeMonkey]

Sure, but the screen doesn't show much either.
I attached 2 so all of the details could be shown.
This happens immediately after I press OK for the security elevation request.

 

[CodeMonkey]

I believe I managed to get a stack trace:

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="MpeInstaller"
StackTrace:
at MpeInstaller.Controls.ExtensionControl.Filter(String str, String tag)
at MpeInstaller.Controls.ExtensionListControl.Filter(String filter, String tag)
at MpeInstaller.Controls.ExtensionListControl.comboBox1_SelectedIndexChanged(Object sender, EventArgs e)
at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(EventArgs e)
at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32 value)
at System.Windows.Forms.ComboBox.set_Text(String value)
at MpeInstaller.Controls.ExtensionListControl.Set(ExtensionCollection collection)
at MpeInstaller.MainForm.RefreshLists()
at MpeInstaller.MainForm.chk_stable_CheckedChanged(Object sender, EventArgs e)
at System.Windows.Forms.CheckBox.OnCheckedChanged(EventArgs e)
at System.Windows.Forms.CheckBox.set_CheckState(CheckState value)
at System.Windows.Forms.CheckBox.set_Checked(Boolean value)
at MpeInstaller.MainForm.Init()
at MpeInstaller.MainForm..ctor(ProgramArguments args)
at MpeInstaller.Program.Main(String[] args)