I too had this problem with a charger (stock, original Samsung) I bought from a local store (stock 2.3.6). My touch screen didn't work at all when I connected to that charger.
So I went to the store, and changed the charger (a charger of the same model having the same model number!) and it was Working with no problem!!
Dont know the reason for this behavior, but it's something with the charger!
Current Phone : Samsung Galaxy Note II (N7105)
Current Tablet : Samsung Galaxy Note 8.0 (N5100)