Internet Explorer 8 can't see community

i have two sites testing elgg. Both are on the same host. One does not allow view in IE8. The other one is fine. Nothing is really different.

I put it into compatibilitty view. not working. I did see some FS token or something roll by in red. Can't get that back.

I don't understand it. I am using the identical browser that I was using on the other install on the same host. Wierd.

In admin it says that user is logged in, but on the IE you can not navigate anywhere as that user.