Do they credit you interest on unused Margin?
Yes, that says your down 57 bucks. You did 1 short and 3 longs. 3 at 1 mini lot and 1 at 2 mini's. one was closed with only 1 pip loss.
I never seen that screen before btw. Now I learned something new.
What I do is this:
The first image you posted in the first post, with the "Account Balance".
I right click the line with your info.
Then I click "Reports"
This opens up a browser window asking how far back you want to go, and I get a really nifty page, with beginning balance, ending balance, a table with my trades, Settled trades, open orders, open positions, and total P/L.
That's what I've always used.
That first screen you're looking at is misleading too. It looks like you have an open position. This screwed me up two times and gave me a margin call for misunderstandings.
That 4019 is how much your worth at that moment. If you go down or up a pip it will change. '
Or maybe that was equalty. hm.....
I think I'm right and equalty is how much your position is worth at that moment, and the 4019 is constant.
Forget it. But USDMRG is how much money is being held per lot. That stays constant and you get that back if you hit 0 dollars. And so on. It's very selfexplanatory.

I haven't held a position open that long where I looked at it in a while, luckily.