Getting Message - "There was an error activating your account"

Hi

I am getting an error message to "Activate my account" on my Buddypress MU install. I have upgraded to all the latest versions of my theme, BP and WP. I am using BuddyPress Social 1.2.2 as my theme.

This message happens spradically with some users. The registration process goes through perfect, they receive the email with the activation link, then click on the link and their account activates fine. They can login and start using the system, but that activation message pops up for some. Big red error message saying there was an error activating your account, please type in the activation key.

I do not send them any activation keys... I include a screenshot of the page that open, I was unable to get the red error message to show.

Thanks guys!