problems with kde

Dear Fedora Experts, I'm a proud user of Fedora (currently 20) Linux on a Dell Laptop since 6 years. A couple of days ago without any real reason something broke up (the only thing happened is a write error but after that it worked fine) and I get serious problems in login into my KDE account. It takes half an hour and after that I'm in a crippled system. Each command I type gives as a reply "no more processes." Also menus and windows are quite unresponsive. Today after many desperate attempts I logged as root on KDE (I know this is something to avoid) but with the root account everything is working fine. I got into in few seconds and any command works as expected. So I suspect that something happened to my user, so I removed the .local configuration without any luck. I would also send you some logs but I can't imagine what could be useful. Anyone can help me to solve this issue? Thank you in advance Walter --