OS X V10.7 Lion :: Download Won't Start - No Progress Bar

I purchased Lion at the App Store. I hit Download, it goes grey for about 3 seconds, then "Download" shows again. I get no progress bar. It appears to be locked up for some reason and won't start the download. Lion is listed in my Purchases, so the purchase appears to have gone OK. It just won't start the download. I am running OS 10.6.8, on a 2x2.4GHz Quad-Core Intel Xeon.

I dragged the following to the trash:
~/Library/Preferences/com.apple.appstore.plist
~/Library/Preferences/com.apple.storeagent.plist
~/Caches/com.apple.appstore
~/Caches/com.apple.storeagent

Maybe it thinks I have already downloaded but I can't find it in my Downloads, and the "Download" button would not be there if it thought this.

Info:
Final Cut Pro X, Mac OS X (10.6.8)