Problems at closing and some more...

When I Close the InteractBuilder there is a note "Interact Builder 4.0.385 has stopped working, Windows is looking for a solution" and the program won't shut down. I have to use the Ctrl+Alt+Del to Close IB. I have installed the IB version 4.0.6, build 385. I made a clean install by moving everything from the old 3.0 folder and even searceh the register to get rid of old garbage there. IB also hve some problems at startup, it is slower and sometimes hangs. Not like the old 3.0 was. Any idea?