What happens is that each time you log on the 'server' it leaves a small file on your computer called a 'cookie'.
When you replaced your computer all your 'cookies' went with the old one so the server or site doesn't recognize you anymore.
In setting up your 'browser' on the new machine you have to tell the browser to 'accept cookies' so it will perform like the old one after it gets its share of 'cookies' in its files.
So actually the problem is on your end because of the new computer.
You also lost all your saved login data files so you will have to reconstruct them as you go along.
These are the files left on your computer when you log in somewhere and under the login info is that little box that says something like,"Remember me on this computer" and you check the box and the server leaves you a 'cookie'.
Clear?

?
~~~GB~~~