Know that we are all volunteers living in different time zones.
BuddyPress does not enqueue any styles which would affect the layout of your theme. Have you tried checking out Yoo’s forums to see if there are others whose layouts were affected when BuddyPress was installed?
Do you mean you cannot post in yoo theme’s forums? They’re supposed to provide support for their premium themes and for BuddyPress http://www.yootheme.com/themes/documentation/customizing/integrate-buddypress though it looks like they haven’t updated the information. As mentioned above, BP doesn’t interfere with the layout of your site. We don’t have access to the premium theme. The best place to get assistance is in the theme’s forums.
the problem is Buddypress.. not the theme… Buddypress just simpley blocks main css files from loading only in ie8 and ie9 !… and i really dont know why … no1 else have a idear why and how to fix the problem !??