Hi dear Jesus,
I tried the file you kindly provided and it worked.
Thanks for your support. Indeed, building an open source software makes a serious responsibility for users to send feedback and help to improve the software day to day. I feel like I have a participation in the BigBlueButton project and need to help growing this fantastic project. My responsibility is to give you my feedback based on my knowledge constrains. I had used many online conferencing systems before such as WizIQ, Openmeetings, Anymeetings, Adobe Connect, TeamTalk for a long time and this is the starting point of my experience with BigBlueButton. In each of them I found positive and negative points.
Now, I look forward to have the best experience with you guys and want to say that the start point for me was perfect
I said all of these to sweep out a bit of your tiredness and thanks for your good support.
Thanks to BBB team
AmirReza