I am having problems with the blocking (no, I don't have the URLs, they've been cleared) and I do not receive notifications. I do find status noting that the Safety Minder has been disabled (over about the past month) and I strongly suspect that the sites that should be blocked are being accessed. I have Windows 7, and we use Chrome, IE and Firefox, most current versions as we get updates as they become available.
Since this appears to be a broader problem, any thoughts of notifying the admins for the accounts? I hadn't realized that there was no protection until I happened to briefly see something. Because I did not see notifications, I had wrongly assumed that there were no attempts to access the blocked sites.
So from my point of view, the problem might have been solved for a few users, but not universally. And definitely not solved for those who might still be blissfully unaware of what is going on.