Seems to be on the blink again at the moment.
When I launch it it just sits at the animated "48" logo.
Use the website for now until it starts working again.
Hope this helps.
Edit: as soon as I hit send it sprung into life after a delay at the animated logo.
If it continues to not work for you maybe try uninstalling it and reinstalling it?
I've had to do that a couple of times over the years when it crapped out.
