the third time Coinarch.com website has stolen money from me.
That's rough but i wouldn't call this stealing money, As far as i can see, this sort of thing happens on bitfinex and bitstamp as well. I think their main problem is that they are understaffed. This leads to panic which is piled on to when people start losing money. I personally don't use a custom stop loss but use my own API i implement in firefox.
Coinarch is broken, script is setup to lock up when you make money,
hahaha, this is pretty funny but not really true, i have read their source code and the main problem they face is caused by forking of the bitfinex API, since that is where they actually do the trading the website is just a portal. But i admit their server lag i extremely frustrating! I think if they fix this their site would assume some stability in the high volume areas of bitfinex order book (that is actually where the problem lies) and after bitfinex comes online they have to restart their server in order to resume their trading, this would not be necessary if they autosynced instead of only connecting to the API when trades are sent but autosyncing requires extremely expensive equipment, so i guess they just lie in a tought place in terms of net worth to hardware ratio.