People started hacking, the main guy which was I think xZeroKoolx started hacking along with some others. Now Roblox shut the site down to prevent things from happening, they really need to start fixing stuff on their master server like Blockland and minecraft have.
-NEW-
A guy named Leeav(or several others) was able to hack into the accounts builderman and StealthPilot yesterday or something, he still has access today and basically he may have control over everyone's account. People say he was able to get in because when they updated the website recently they did not encrypt it well. Roblox officially fails, they're new slogan should be "A company that gets hacked by children".
Since September or even June 2011 and even now they have had glitches after every time they would update. The glitches would let people insert our own content, enabling people to delete bricks in games. SOMEONE even made a hacked RobloxApp....
Proof: /Forum/ShowPost.aspx?PostID=65458900 ---Put that link after the the roblox website (I can't post the link because Blockland wont allow it)