You can clone with
HTTPS or Subversion.
In the example, once you start incrementing the last slide and then go back (left), every attempt to go right will not move you forward but instead increment the last slide. When it's full, hitting right will again take you forward.
Confirmed, can't say I have too much time though, if you'd like to try and fix it it would be great :)
Me neither, I'm afraid. Sorry to just come bringing bad news but I figured at least it was better to get this known.