Versions: BuddyPress 1, bbPress Alpha 6, WPMU 2.7.1 — I had this same problem with the 2 previous “releases” of BuddyPress.
Problem = Newest, Active & Popular links on Members & Groups widget.
When using WAMP the “switcher” works perfectly. When I put the site online, those links break. The only way I can get them to work is to use default permalinks. Bluck!!
I host with GoDaddy (stop laughing and feeling sorry for me). Everything works until it’s on their server so I’m assuming that they’re the root of all of my problems (as usual). Is there anything required to make that function work? i.e. “check your phpinfo and see if such and such is on”