A collegue just mentioned, that our sites are on a htaccess.

Hope this hints will help.

Can you check your permalink structure settings?

If you use Plain permalink settings, wordpress doesn't open its API. Not all
plugins and themes use that, but many yes like our plugin. So generally it is not a good practice to set Plain permalink structure from many reasons (SEO included)

Let me know if this is your case please.

Have a nice day

we just installed the Pro-Extra extansion and we have the following issue.

When we enter the settings, get on "License", the ring does not turn into a button. It constantly loads and if we enter the key, it does not accept it. This happend to us on dev-server and on localhost. 

We thentried the plugin on another wordpress with less other plugins and then we had the button with "activate" in it, but we get the error Activation failed Error: Consumer key or secret is missing. In case of troubles with activation, try it in 1 hour, if it doesn't work neither, don't hesitate to contact our support.

Your assistance would be highly appreciated.

Thank you.