Well, I just made another discovery. It turns out that it occurred to me to change the Plasma theme, make some modifications and others in my KDE and something happened to me that has happened to me on other occasions and that until now, I had not found an effective solution.
It has happened to me that every time I log in, they only load the icons to the Network Applet, neither the sound one, nor the Clipboard. Besides that, opening an app is almost impossible, and it doesn't work KRunner ni Dolphin.. Anyway.
Checking in the file ~ /.xsession-errors I got this:
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
I started looking and the only solution they offered was to rename the folder ~ / .kde, but it was not viable for me, because I could lose my settings.
So I looked inside that folder for something login related and deleted all content from ~ / .kde / share / config / session
And ready!! If anyone by any chance knows of the ultimate solution for this, let me know. That happened to me with KDE 4.8, KDE 4.9 and now with KDE 4.10.3.