Zoho Projects not activating

I opened the developer ZSC key section in one window
opened the projects Add-on section in another.
Clicked Activate
Copied the key and made sure no spaces in front or back...
copied my email address, again made sure no spaces

Clicked Next and it just closed and took me back to the 'Activate' button again.
I click it and do it all over.

Just keeps happening.
I tried this in Firefox, IE (with and without compatability turned on), and Chrome.

Any ideas why this is not working?
I have the Professional version of the CRM.
Thanks,
Richard