Nope. They did try (pushing it down as low as 9.5ish), but failed and eventually seem to have given up.
Which means that MP got some good profit out of this. And now he's complaining?
This was the first time he ever traded there. Pretty sure it's also the last (for the noted reasons).
Yeah, I, too, hate it when I have profit.
This was/is a long position in any case.
Or so you say...
At the very minimum you get MPEx signed receipts, so you can clearly prove what happens, rather than the situation here where the site does something,
Ehm... Suppose there is a connection problem and you DIDN'T get a signed receipt.
Now what, can you prove that you HAVEN'T got it? You don't even know whether server registered your trade or not.
Do you know a story about Byzantine Generals? Look it up.
BTW trade via colored coins will be Byzantine fault tolerant in some way (due to use of Bitcoin protocol which is Byzantine fault tolerant), while simplistic HTTP-based trade won't be, ever. (Not that it matters that much, but it's nice.)