A WebmasterWorld thread has continued discussion over the past week or so, of the Microsoft Live.com page submission tool being broken.
Microsoft has numerous page submission pages depending on the geolocation of your site. There are various reports of the page bugging out on users.
I have tried the US page and it seems to work fine for me.
But after continued discussion, it is clear that the page is not working for some users.
It can be specific issues with certain browsers or security settings, I am not sure.
Forum discussion at WebmasterWorld.