Just before I read this, I changed my theme to the final one I’ll use (Arras Theme with the Classical Gamer child theme : http://arrastheme.com/ )
Your second solution worked well, but now I have an empty bar as wide as the admin bar just under the real admin bar, here is a pic : http://puu.sh/IhLa
It’s just the top of the page, I think it’s clear enough
In any way, thank you for your solutions and explanations. I can’t wait for BP 1.6, I may even test the 1.6 beta to see how it’s integrated, I’m very interested by this
@mercime Thank you for your answer, but by reading what you linked me, I noticed that I was totally wrong on the words I used : I wasn’t talking about the “widget sidebar”, but of the “admin bar” that is on top of the page. On buddypress’ website, I see the WP admin bar, and that’s what I want to have on my own site.
Then, the answer may be in what you linked, I’ll re-read it to see if I find an answer, but even if I mentioned the Admired theme, I think I’ll get the same “trouble” with any theme (I hope I’ll be understood )