After a very long absence, I have finally returned. I'll bet none of you even remember me!
Anyway, I got a new Arduino Uno R3 yesterday in the mail. I installed Arduino Software 1.6.3 (latest stable release) and tried to upload the Example sketch, Blink.
It compiles fine and finds the board fine. But when it comes to uploading, it always get's stuck. It never gives me a message telling me the upload is completed. The progress bar always stops at about 80%. I have been letting it sit like that for about an hour now.