I tried in real several asset file and I received Lot warnings or picost warnings. Nothing regarding margin.
Trades are 10 times bigger than expected i.e. with only one losing trade you can vaporize your account.
I Have been lucky because my trade was positive and I manually close it.
I imagine what could happen with people trading Zx systems with Oanda...
I wrote to Oanda support, Zorro support and several post on this forum regarding the issue because I guess it should be addressed as priority one.