Double trades engaged...arrrggghhhh!

I was placing my trade just now in the practice account while on the line. After the trade was submitted, nothing happened. I waited for a while for the trade to appear on my chart, but still nothing shown. Not suspecting anything (or rather not remembering to suspect something, coz such cases happened before), I went ahead to resubmit another trade. Still nothing shown on the chart. It was only then did I recall the problem and restarted my VT Trader. Sure enough, I had actually placed 2 exact trades. Now I must pray hard the market moves in my favour, otherwise I will incur double loss!