Every time when I make a new level with Jazz Creation Station and I use in it events like Buttstomp, when I try to play the level with JazzJackrabbit I get Access Violation and the game crushes. Can some one tell what could be the problem?

Are you using flipped destruct blocks, by any chance?
For whatever reason JJ2 crashes when attempting to load levels that have flipped animated tiles with destruct/stomp/trigger events of them.

That was the problem. Thanks for help!!