Hi there. I'm sorry that my first post is a question, but I really need help cause Minecraft isn't fun without the hacks ^^

I've played Minecraft with the World of Minecraft -Client for a cuple of days. Everything was fine. But out of sudden the fly and speedhacks aren't working anymore on every server.

I've downloaded the client again, replaced the minecraft.jar and even reinstalled java but it's still not working

The "Enable Hacks" button is checked of course.

Thx for every upcoming help :)

PS: I'm sorry for my bad english, too ^^'