Hi,
Probably you are experiencing a jQuery conflict problem in the Joomla Backend. Because our plugin uses AJAX (which is held by jQuery) to communicate with our server in order to register your license+domain into our system (it is not actually a validation, it is just registering..)
Please follow this.
1- Open the "Flexible VM3 TEmplate" plugin in your joomla backend using Chrome Browser
2- Open the Chrome Developer Tools (Shortcuts:
F12 on Windows,
Cmd + Opt + I on Mac)
4- Refresh the page
3- Navigate to "Console" tab
5- Check if you see any "RED" warning in the console tab.
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Regards