Snapshot 13w05b, Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w09a
Windows XP, Intel core 2 duo CPU E4500 @2.20Hz
1.18GHz, 2.00GB of RAM.
Java 11 update 13.
Okay so i found out a duplication glitch with hopper minecarts!
Look at the pictures below, please patch this dupe bug.
you make a an L shaped rail put 5 hoppercarts together on same rail peice
then throw any item in to the hopper by pressing Q, throw 3 in the hopper.
now you punch it, fake (item used) comes out, after you break it a ton of (item used)
this happens in survival & creative.
video proof of the duplication glitch