thanks,jcl,for your fast response. I've uploaded the 'Z5demo.txt' which actually should be 'Z5demo.log' from folder 'Log'. You can read through the whole text file and maybe will tell out the reason. My broker is FxOpen UK. If you need more file from me to analyze the problem,feel free to ask.
It's midnight in Asia. I am about to bed. if you give a new post, I will response right after I wake up tomorrow morning.