Recieving "Invalid Activation Key" After Email

I am running a multisite with WP 3.8.1 with subfolders and i am able to create a new user from the front end on the main blog, and receive the email, but when i click on the email i receive..

"An error occurred during the activation
invalid activation key"

I also dont see unconfirmed users in the Network Admin Panel or the Main Blog Admin Dashboard/Panel.

I also tried in different browsers with no luck.

Any help or guidance would be greatly appreciated.

EDIT::: I installed the plugin "Unconfirmed" but i still dont see unconfirmed users either at the Network Admin Dash or the main blog dash..

From initial research it looks like utilizing a specialized plugin that is compatible with MU and BBpress would be much better???