This is probably because your privacy settings are too aggressive in Internet Explorer.
Try this:
1. Under the “Tools” menu in Internet Explorer, click on “Internet Options”.
2. Under the “Privacy” tab, click on “Default” (if it’s not grayed out).
<v:shapetype coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f" id="_x0000_t75"> <v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" aspectratio="t"></o:lock></v:shapetype>
Click “OK”, then close Internet Explorer.
Try logging in again.
If the problem happens again, then try this:
under the “Start Menu”, click on “Programs”, “Accessories”, “System Tools”, then “Internet Explorer (No Add-ons)”.
Try logging in to this website again.
If TntMPD still asks you to Verify your OpenID, enter this as the OpenID and click the button:
https://www.tntware.com/gcxopenid
If you still don’t get any further, I’d suggest you try Firefox (a different web browser than IE):
http://www.mozilla.com/en-US/firefox/ie.html