When that has happened to me, I click on the disabled button, and then, magically, it becomes enabled. At that point I click it a second time and it works.
"I take sibling rivalry to the whole next level, if it doesn't require minor sugery or atleast a trip to the ER, you don't love her." - pete_roth
"Yeah, I see why you'd want a good gas whacker then." - VRock