Wast3d , the patch is available online now. You can try it, it should work now. (i hope!)
GonzoBrian , i have changed something in the load it is why you have this error. (i think in my mail i said you to start a "brand new multiconf"?..
Anyway , try that :
Go in your Multiconf folder, you should find a file called : conf.multiconf , open it with the notepad , and replace the 3rd row by a number (ex : 2 ) (it is the index in the item in the combobox, it is not a problem if you don't put the when which match with your selection , you can change it after )
Save the file , and re-open the Multiconf , it should work now.
Anyway, i think despite the error you saw, your "multiconf" should have been loaded. Simply ignore the error.