Thanks fore reply.
Can you just make the following troubleshooting on your site so that we will get to know is the problem in the plugin or in anything else?
1) Try using default theme and check whether it works or not.
2) Try deactivating all plugins except Buddypress & Buddypress Activity Plus and check whether it works or not. Check these inst
ructions http://wpmu.org/daily-tip-how-to-quickly-disable-all-wordpress-plugins/ on how to do this.
3) When adding the link:
Can you just try enabling WP_DEBUG mode and debug logging? To do this, just go to wp-config.php include this:
You might already have a line for WP_DEBUG, so just make sure it's set to true. This will create a log file under wp-content/debug.log with detailed information.
If you'd like to avoid end users seeing error messages, you can include this as well:
This will prevent errors from being displayed, but you can still find them in the log file. For information on this, checkout this wpmu.org article.
Let me know what errors if any you are getting!
Can you share me the page link of your site where you are using?