Those who said they could not place a trade, because currency pair was disabled/trade disabled:
FXOpen ECN platform has 2 sets of currency pairs in the Market watch - for example EURUSD and EURUSD_Ask.
The ones with _Ask show the chart with the Ask price, if you wish to trade, you should select a pair without the _Ask prefix.
Also, if you installed an EA on a currency chart with _Ask - your EA will not trade. You should install it on a normal chart, without _Ask.
The _Ask symbols may be confusing. The are only provided with the only purpose to show the ask price chart. If you do not need it, you should right click on this pair in your Market Watch and select 'hide' .
Please, check this solution, if you are still unable to trade, notify me immediately (you may post here or PM me)