Hi Manas – For the first issue, maybe @R-a-y can help out, since he’s the BP Group Email Subscription plugin’s author. I wonder if somehow (even though you upgraded to the new version of CBOX) – you are not getting the newest version of the plugin? Let’s wait to see what Ray thinks.
For the second issue – this is slightly different from what several other users have experienced. They reported that the icons were not working on a regular computer (and that issue has been resolved). From what you said above, it seems the icons are not working only on mobile devices? If this is the case, I will open up a ticket for theme developers to take a look at. Can you verify that the icons are an issue only on mobile devices?