Have you tried to recompile your EA?
What is written in agent log?
I have the same problem.
logs.
EL 0 Core 1 09:28:41 agent process started
QM 0 Core 1 09:28:41 connecting to 127.0.0.1:3000
NH 0 Core 1 09:28:42 connected
LS 0 Tester 09:28:42 GBPUSD,M1 (MetaQuotes-Demo): testing of Experts\Examples\kgoeaTmp.ex5 from 2008.10.01 00:00 to 2009.01.01 00:00 to be started
FP 0 Core 1 09:28:42 authorized (agent build 350)
HI 0 Core 1 09:28:43 common synchronization completed
HQ 0 Core 1 09:28:43 3124 bytes of account info loaded
HO 0 Core 1 09:28:43 3768 bytes of group info loaded
CH 0 Core 1 09:28:43 7170 bytes of tester parameters loaded
LN 0 Core 1 09:28:43 76 bytes of selected symbols loaded
EH 0 Core 1 09:28:43 expert file added: Experts\Examples\kgoeaTmp.ex5. 15151 bytes loaded
CH 0 Core 1 09:28:43 expert file added: Indicators\kgoiTmp.ex5. 7070 bytes loaded
RL 0 Core 1 09:28:43 initial deposit 3000.00 USD, leverage 1:100
ME 0 Core 1 09:28:43 successfully initialized
LO 0 Core 1 09:28:43 50 Kb of total initialization data received
QE 0 Core 1 09:28:43 performance: 54
CK 0 Core 1 09:28:43 GBPUSD: symbol synchronized, 2904 bytes of symbol info received
FK 0 Core 1 09:28:44 disconnected
- www.mql5.com
Recompiled doesn't help.
Which CPU type on your PC?
We have fixed some problem is appeared on CPUs without SSE3 support. Wait for the next build.
Which CPU type on your PC?
We have fixed some problem is appeared on CPUs without SSE3 support. Wait for the next build.

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when I try to use the backtester, it always shutdown after 30 secondes
and it is written: history download started
one second after : history download canceled .......but no backtest is done
2010.11.02 20:50:09 Core 1 disconnected
2010.11.02 20:50:08 Core 1 EURUSD: history synchronized from 2006.01.02 to 2010.10.29
2010.11.02 20:50:08 Core 1 EURUSD: load 27 bytes of history data to synchronize
2010.11.02 20:50:08 Core 1 EURUSD: history downloading canceled
2010.11.02 20:50:07 Core 1 EURUSD: history downloading started
2010.11.02 20:50:07 Core 1 EURUSD: symbol synchronized, 2904 bytes of symbol info received
2010.11.02 20:50:07 Core 1 performance: 46
2010.11.02 20:50:07 Core 1 47 Kb of total initialization data received
2010.11.02 20:50:07 Core 1 successfully initialized
2010.11.02 20:50:07 Core 1 initial deposit 10000.00 USD, leverage 1:100
2010.11.02 20:50:07 Core 1 expert file added: Experts\cont3.ex5. 18219 bytes loaded
2010.11.02 20:50:07 Core 1 275 bytes of selected symbols loaded
2010.11.02 20:50:07 Core 1 7170 bytes of tester parameters loaded
2010.11.02 20:50:07 Core 1 3768 bytes of group info loaded
2010.11.02 20:50:07 Core 1 3124 bytes of account info loaded
2010.11.02 20:50:07 Core 1 common synchronization completed
2010.11.02 20:50:06 Tester EURUSD,H1 (MetaQuotes-Demo): testing of Experts\cont3.ex5 from 2010.10.01 00:00 to 2010.10.30 00:00 to be started
2010.11.02 20:50:06 Core 1 authorized (agent build 350)
2010.11.02 20:50:06 Core 1 connected