Repetier suddenly stopped working - fails to start

Todesengel

So I was using Repetier fine for the last two weeks. Suddenly, I went to start it up one day and it fails to load.

I uninstalled and re-installed
Removed Registry Keys
Removed Appdata folder

Uninstalled .NET 4.5
Reinstalled .NET 4.5
Reinstalled Repetier

Still nothing.

The same error I'm constantly getting in event viewer.

Application: RepetierHost.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.ArgumentOutOfRangeException
   at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32)
   at CuraEngine.CuraEnginePanel.UpdateButtons()
   at CuraEngine.CuraEnginePanel.UpdateSelection()
   at CuraEngine.CuraEnginePanel.Connect(CuraEngine.CuraEngineInstance)
   at CuraEngine.CuraEngineInstance.get_Panel()
   at RepetierHost.view.SlicerPanel.comboSlicerSelection_SelectedIndexChanged(System.Object, System.EventArgs)
   at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(System.EventArgs)
   at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32)
   at RepetierHost.view.SlicerPanel.SelectByName(System.String)
   at RepetierHost.view.SlicerPanel.UpdateInstances()
   at RepetierHost.Main..ctor()
   at RepetierHost.Program.Main(System.String[])

Repetier

From the error it looks like something in CuraEngine settings has gone wrong. You could try deleting the setting (or copying somewhere else). Check in work directory (AppData/local/RepetierHost) the CuraEngine folder. Rename it and start host to see if that helps.