I am trying to do somthing I think is sinple but dot seem to be able to get it to work.  All I want to do is to be able to enter a trade on the open and exit on the close of the same trading day. I get the open to work ok but the exit allways exits the next day.   

In the Buy cover (exit a short) I use "close" any help would be appreciated

When starting a New Simluation, click "More" on the System Testing Options page.  Click on the "Trade Execution" tab.  Uncheck "Realistic Market Prices" and have the Buy/Sell Short price fields set to Open, and the Sell/Buy To Cover price fields set to Close.  Set the "Delay order opening" field to 0.