There were some changes to the header.php file. Off the top of my head, I cannot remember if both the buddypress-home and buddypress-member themes had changes. Or, if only one of them had changes.
Either way, the best thing to do is open your header.php file and compare it to the new header.php file of the respective BuddyPress theme.
If I have the Blog-Menu in my theme – the bp_home_slug doest point to the right page (the home-blog) but to an article in another blog…
It should be BP_HOME_BLOG_SLUG, not BP_HOME_SLUG.