If you are not sure which pone mod youhave, download the newest version (again):
/t/9226/1
Also: if you have a firewall running and, during the first start of M3tag, block the request to show the history of changes then also no other internet access will be possible.
You can check whether you have internet access with MP3tag with the function Help>Check for new version.
You should get a message box that either says there is no new version or there is one.
If you do not get any message then MP3tag does not have internet access and is probably blocked by the firewall.