I just started the game, went to Master Roshi, he teached the charge-move.

He also locked the door behind me, and made me stuck forevcer for whatever dirty things he thought up!

Please, free me from the old creep!

If your still stuck try using the charge move over and over again until the training dummy gets pushed into the back wall and disapears.

Did that. Nothing. Still stuck.

The only other thing I've read about is the game doesn't like rebound keys. If you've rebound any of your combat keys you could try putting them back to default and seeing if that allows you to progress.

Or I just uninstal this piece of garbage. Too bad I think I'm out of refound-time.

I had the same problem with Jong. I experimented for a long time and found a solution.
First, save your game before talking to Jong.
Then, you must correctly perform a new combat technique AND hit the puppet AT FIRST ATTEMPT
If you accidentally perform some other attack or miss the puppet JUST REBOOT and try again.
As soon as you manage to hit the puppet with a new fighting technique from the first hit, Jong will say "Excellent" and release you.