Could you change the way the Deposits / Withdrawals are calculated when Custom Start is selected? As it's now, it seems, it 'starts' with a 'virtual' deposit equal to the balance at the day of the last Deposit. Then it uses this number to calc the % Gain. The problem is that between this 'virtual' deposit and the Custom Start the account could have gained / lost money. I think the 'virtual' deposit should be the Balance just before the Custom Start. In this way the % Gain would reflect the 'real' gain of the selected period. As an example, my Alpari portfolio has a Custom start of 01 Jan 2010. At 31 Dec 2009 I had a balance of 2859.43E without open trades. In Jan my profit is 940.11E. I have no deposits/withdrawals in 2010. The gain is 33%. Myfxbook considers the Deposit 2575.77 so the calculated gain is 34.81 and 36.5 for absolute gain (and don't ask me why are the two different).