Ok, for all of you out there playing AC3 on your PC and for all of you stuck on a so called glitch or bug called the Ledger glitch or Homestead Ledger bug, I have found the answer.
And the answser is... there is no bug. Pressing the right arrow key on your keyboard will allow you to continue on to the next bit of the ledger before ending the memory and sequence.
I even played the game through to this point a second time just to make sure I was right about it.
Cheers! Have fun with the rest of the game.