After log out i can not log in again, password field freezes

I press to logout and system logges out, then i try to login again , i choose user type password, and press enter, but then password field gets empty, and no any actions more. i try to choose that user again, but it is not clickable already, that user is unavaliable. Then i try to choose other users, but no any effect, each clicked username field get noresponding.
then i try ctrl+alt+f1 and i type in concole about GDM restart /etc/init.d/gdm restart
After it GDM restarts and login screen comes and works. i log in, then everything seems normally. But when i try to open for example , firefox, i get error: firefox is already running. And also are other apps. No any app works.
After some investigations i detecdet that it is workspace crash, main workspace crashes after these operations, processes runs in taskbar, but no any workspace to view processes