Hi @vijjuxtra,
Sorry to hear of the problem you are having.
I have tested it on my test site using latest version of BuddyPress Activity Plus plugin and it’s working fine for me.
This can also be due to plugin/theme conflict.
To find find out plugin/theme conflict you can just try on your development site using default WordPress theme like Twenty Thirteen and deactivating all other plugins as displayed in the following flowchart to know which theme/plugin is conflicting if any.
https://premium.wpmudev.org/wp-content/uploads/2013/12/Support-Process-Support-Process.png
If it is not theme/plugin conflict then this can be due to the issue with your WordPress install so try creating a test site on the same server and use this plugin on it.
If it’s not working on that fresh WordPress install also then this is your server issue so contact your hosting provider to resolve this issue.
The BuddyPress Activity Plus plugin is working fine and you can confirm it by using it on your site which is hosted on any other server or on local server.
Best Regards,
Vinod Dalvi