Hello, Thanks for your answer. I have logged out from user2's desktop on screen 2 normally before tried to log in on screen1. Here is step by step what I did: 1. login as user1 on screen1 2. start manu -switch user - open desktop on screen2, lock button is not checked - clik OK. 3. login prompt appears on screen2 4. login as user2 on scren2. 5. do the job 6. user2 logs out normally from screen2 7. user1's desktop on screen1 comes back as it were left before switching 8. user1 logs out from screen1 normally 9. kdm login window appears on screen1 10. trying to log in as user2 on screen1. login starts but when the kde splash goes to the 3rd icon the X server restarts and gives back the login window. However user1 still can log in on screen1 as user1, and if logged, can switch to screen2 and login as user2 on screen2. I think kde remembers the the last login screen and stores this info somewhere. This may block the login from other screens. Thanks, IG