Testnet blockchain split?

[Economics]

Hi I'm seeing some transactions on testnet that were confirmed and are now not confirmed.  I'm not sure what this is called, so I'm calling it a 'split' where maybe a parallel blockchain tookover the official blockchain.

Here's an example transaction id that was confirmed:  a6d8feac3a7aba1da8fe11a35a54274c5f2bcff953f24370d970020f873e5555
It was 500 BTC received from mveRCV1jkAKstF4rDet8iUwE793TKdPVum

It was sent on 8/21/2011.

Can anyone explain this for me?

Thanks

--E

[1713506071]

1713506071

[jackjack]

There was a post about that a couple days ago, in the discussion forum
Basically somebody mined blocks on his own disconnected from internet, managed to get a longer block chain and then released it
All the clients forgot the "true" shorter blockchain and accept this one