Partitioning....Nothing happens :-(

Hey Guys, (sorry if I do some english mistakes ;-)

I have a problem with partitioning my USB-Stick.

Everything works, the program downloads the Firmware ant then the word "Partitioning" appears.

But after that nothing happens anymore. There is no more advancement for hours...

I´ve already tried to fix this problem with different USB-Sticks but nothing works,

always the same problem.

 

Anybody here who has a solution for this problem?

By chance do you have 'Clean My Mac' installed?