I had a quick message from Vbox telling me I need flashplayer. The message disappeared and I have seen the video.
To continue my test, in my forum I clicked on "Reply" to insert another Vbox link and while I was writing the first video on previous message started...
Now I have two messages with a Vbox clip in each. If I click on "Reply" the two videos start together.
Click "Post Reply" or "Reply with quote" make Vbox videos starting (only Vbox not Daylymotion or Youtube) in forum with same subject.
I hope you understand my poor english