Playing on two machines? PBEM: error

[Listy]

This has probably come up before, however searching for the Error brings up just about every post in the forum, so I apologise for wasting everyone's time.

I think the following is the cause of the error.

We're trying to play a PBEM game. I'm trying to play on two different machines. One is the work PC, the other is my home PC.

I started the game on my work PC, now at home I wish to have my turn. However all that happens is an Error message "Player 2-Path to game has changed" comes up.

Would this be because the File path of the game is different? and if so, how do I get around this issue? (short of going back to work, which is not an option as I'm on holiday for a week).

Edit: Oh yeah I'm back, and hello again!