BuddyPress.org

Now that’s weird. In your previous activation, only the register function did not work so it is ironic that now only register is working and the BP component pages are not. From where you were in your post above:
1. Deactivate BP Template Pack, then delete BP Template Pack folders/files within your active theme folder.
2. Activate BP Template Pack, check if all pack template files were transferred in your active theme’s folder. If not, transfer only the missing files observing folder structure.

I just activated BP Template Pack v1.0.2 in a WP 3.1 RC2 and BP 1.3 trunk 3805 test installation earlier today and all template files from BP Template Pack transferred to twentyten, the active WP Theme and working great. Of course some styling needs to be done but other than that, looks okay.