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Published on Jan 9, 2009
This glitch came about after the 12/11/2008 TF2 update which allowed Engineers to upgrade their teleporters and dispensers to level 3. BLU Engineers were able build a dispenser on top of the payload, and as far as I understand the dispenser couldn't be destroyed as it was solid to players and projectiles.
However, this exploit was fixed after the 12/15/08 update.