Thanks Pablo. When I go to that URL, I see the two license I buy and it looks like temporary URLs attached to them. There is only one URL per license, but the temporary URLs are difference from the live URL for this key, which should be www.myfriendsdentist.com
The only sollution is to login to those domains and deregister your key manually from betheme.
If you already removed betheme from that domains and you want to deregister that key, you can click the 'deregister' button - the one you see on the screenshot.
Comments
this message could mean that your license key is used on more than one domain.
Please use this tool to manage your license keys:
http://forum.muffingroup.com/betheme/discussion/36219/cannot-register-deregister-your-license-key-use-this-tool#latest
thanks
Please send this information privately thru the contact form which is on the right side at http://themeforest.net/user/muffingroup#contact and we will check what might be the reason.
Notice!
Please attach a link to this forum discussion.
Thanks