Error with Internet Explorer 11 64 bit

Hi

Any attempts to login with IE11 64bit return “unknown error occurred”, but it still logs in, but you don’t know until there is a page refresh.

It works fine in every other browser I’ve tried (firefox, chrome, safari, opera ) on both PC and Mac, but no matter how we try to log in on IE 11, we get this error.

Can you help?

Thanks!
Dominic

https://www.ads-software.com/plugins/login-with-ajax/