Re: crash!!!
Warning: bp_show_register_page(BP_PLUGIN_DIR/bp-core/bp-core-signup.php) [function.bp-show-register-page]: failed to open stream: No such file or directory in /home/www/missionaries.net/wp-content/themes/buddypress-home/functions.php on line 70
Did you deactivate the bp plugin? It doesn’t seem to be running. If it’s not available for selection then check the /wp-content/plugin dir for it’s existence. If it doesn’t exist reinstall it.
Finding out why it got deactivated or it doesn’t exist anymore would be the next step.