Since IE10 has installed on my Windows 7 box, it is impossible to login into my application... It was OK with IE9 and it still OK with FF and Chrome.
The problem is that
I've had a similar problem and just added to the Web.Config in IIS cookieless="UseCookies" in the Authentication section.
I've found what happens, and it can be usefull for others. @Mark Ormston was not so far : Cookies set with path /cas are send by IE10 to URL beginings with /cas-services
In my case /cas and /cas-services are not in the same WebApp and each have its own JSESSIONID. Sending JSESSIONID created for /cas to /cas-services lead to the problem describe above.
To correct, I simply rename /cas-services with /app-services (I guess that everything not beginning with /cas should work).
JM.