Re: localhost under xampp, windows vista
There are two plugins that you’ll need to sync up the cookies; one of them is included with BuddyPress under bp-forums/bbpress-plugins/, this one gets copied into your bbPress/my-plugins/ folder. The other you will want to download from the WordPress plugins repository (wordpress.org/extend/) and install and activate in your WordPress admin.
Once you have each plugin installed, one for each platform, configure them and follow the directions for each one, and then report back. 
