A quick note from globally regulated broker FxPro today, they have announced that margin call and stop out levels for MT4 will be changing as of October 20, 2014.
At margin levels of 25% the Firm will have the discretion to begin closing positions, starting from the most unprofitable one.
In addition, at margin levels of 20% the Firm shall automatically begin closing positions at the prevailing market price, starting from the most unprofitable one.
This does create some additional wiggle room for clients to get out of some bad trades which could lead to a recovery and thus more volume. As always, the best course of action is to keep your risk levels within a plan, set stop losses yourself and keep leverage low to avoid any margin calls on your account and automatic stop-outs, happy trading.