Well, I was wondering when others would have this problem.
I've had exactly the same problem. First it was on the passenger's side. Took it to the dealer, who said "leaves and debris" had stopped the hood from closing.
Then, yesterday, the driver's side did it.
I got the hood to close by pulling a little harder on the open lever in the driver's footwell.
I was at the dealer today for another issue and I told the SA that this is design or manufacturing issue.
I don't think it'll be long before BMW starts hearing about this and issues a fix.