ok guys, i set up my php error logs and i am getting this
[20-Aug-2009 11:22:16] WordPress database error Table 'database name.wp_bp_activity_user_activity_cached' doesn't exist for query SELECT * FROM wp_bp_activity_user_activity_cached WHERE user_id = 1 AND date_recorded >= FROM_UNIXTIME(0) ORDER BY date_recorded DESC made by require, require_once, do_action, call_user_func_array, bp_core_do_catch_uri, load_template, require_once, bp_has_activities, BP_Activity_Template->bp_activity_template, bp_activity_get_user_activity, BP_Activity_Activity->get_activity_for_user
[20-Aug-2009 11:22:16] WordPress database error Table 'database.wp_bp_activity_user_activity_cached' doesn't exist for query SELECT count(id) FROM wp_bp_activity_user_activity_cached WHERE user_id = 1 AND date_recorded >= FROM_UNIXTIME(0) ORDER BY date_recorded DESC made by require, require_once, do_action, call_user_func_array, bp_core_do_catch_uri, load_template, require_once, bp_has_activities, BP_Activity_Template->bp_activity_template, bp_activity_get_user_activity, BP_Activity_Activity->get_activity_for_user
[20-Aug-2009 11:22:50] WordPress database error Table 'databaase.wp_bp_activity_user_activity_cached' doesn't exist for query SELECT * FROM wp_bp_activity_user_activity_cached WHERE user_id = 32 AND date_recorded >= FROM_UNIXTIME(0) AND is_private = 0 ORDER BY date_recorded DESC made by require, require_once, do_action, call_user_func_array, bp_core_do_catch_uri, load_template, require_once, bp_has_activities, BP_Activity_Template->bp_activity_template, bp_activity_get_user_activity, BP_Activity_Activity->get_activity_for_user
seems like a table is missing. i recently upgraded to wpmu 2.8.4a and bp 1.0.3