It was stated a couple of times earlier in this thread that when you trade a cross from a USD account your $$ are converted in to GBP (as per the GBP/JPY example), then the transaction is made. That's not right.
When you do any forex trade at all, you borrow the currency that you will be shorting, convert it in to the currency you will be long, and deposit the latter. The borrowing and the depositing is where your interest rate differentials and carry come in to play.
So in the case of GBP/JPY, if you were going long 1000 at 230 you would borrow 230,000 JPY, convert it in to 1000 GBP, and deposit the GBP. Now assume that GBP/JPY rises to 231. That means your position is worth 231,000 JPY. Since you only need to repay 230,000, you have a profit of 1000 JPY or about 4.3 GBP. That profit will get converted in to USD to be credited to your account.
That 1000JPY/4.3GBP profit, of course, will get converted at current rates, so the movement in the market will definitely impact your net profit at the end of the day. Someone earlier said that the pip value would be fixed. That's incorrect. It varies with the GBP/USD and USD/JPY rates. As someone holding a GBP/JPY long, you would want the cross to rise thanks to a rising value of GBP because that would actually increase your profits.
No matter what, though, if your cross trade produces a profit, the conversion back to USD will never result in a loss. It will just impact the size of the profit.
Hope that clears things up.
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