Unable to login to a website.

[Flycatch]

After I upgraded to IE11 I'm unable to login to a website entitled Blog Talk Radio. I had no problems before the upgrade and this appears to be the only thing affected. I'm a user of the internet and not computer savvy on the technical side.
I contacted the technical support division of Blog Talk Radio and they informed me that my browser was not compatible and should be using FireFox and the most current version of Adobe Flash Player. When I told them that it worked with IE10 they had no answer why it should have. My Flash Player is up to date so that is not the problem
Is there anyone who can help correcting this problem.

 

[ThrashZone]

Some of the new security features might be conflicting,
But first confirm if Enhanced protection mode has been activated,
http://www.sevenforums.com/tutorials/280434-internet-explorer-10-enable-32-bit-64-bit-ie10-windows-7-a.html
Also if you see a Blue circle with a slash through it click it to disable Activate x filtering,

You can also access it by clicking on the Gear symbol on the top right and click on Safety,
See if anything here is checked.