I have been using a simple strategy to generate ideas for trade decisions; it takes about 1.2 seconds to run on historical data (5 minute bars) on 100 symbols, 800 bars. I have been succesfully running this strategy on 85 symbols in the strategy monitor for a few weeks. Two days ago, the program began freezing up (got a "program not responding" message from windows)during the data update for up to 15 minutes. I tried two different computers on two networks and restarted the computer. I called Fidelity Active Trader and they said nobody else had reported data issues.

The program is running on 5 minute bars and I use the data manager to update the database every day before starting the program. (By the way, Data Manager runs fine and updates quickly). I feed the alerts (stop orders) to the Quotes window to monitor.

Finally (sorry, unrelated), I think it would be useful to have alerts automatically fed to the Quotes window and to have an option to elimate duplicate symbols automatically from the Quotes window.

Thanks.

Does this happen with only that particular Strategy when it runs in SM, or others are affected?

I have tried two different strategies (both of which ran previously without difficulty) with the same result. I have attached the code of one of the two below:

CODE:
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There's a bug in the 5.1 Strategy Monitor that causes it to "freeze" intermittently. It will be fixed in the next release, hopefully due out within a few weeks.

Thanks, that would be wonderful. I really like the ability to feed alerts for prospective trades into the Quote window to monitor on a tick by tick basis and would love to see it fully functional.

One last thing, I had no problems with the strategy monitor until about 2 days ago, when it began freezing up more and more frequently (it was nearly continuous on Friday). Any idea why the frequency of the problem increased?

None other than the obvious reason that you're hitting the offending code path more frequently. I really don't know anything about the details of the problem or the solution to fix it.