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No, I cannot: it is just the same.
(I, however, never used other window managers since a recent system update, so I do not know if they are in my system at all. They are naturally on the xdm login window as selectable options, and now I saw that they do not work either, but I do not know if they would have ever worked.)
However it should not be a username or password issue, as I can login from the console.
It should not be an X11 issue, either, since I can start kde as root.
Distribution: K/Ubuntu 12.04/14.04, Scientific Linux 6.3/6.4, Android-x86, Pretty much all distros at one point...
I'm almost 90% sure that you set your security too high, such that XFree86 is not allowed to be run by ordinary users. Alternatively, you accidently set the security clearance required to run X to a level higher than your ordinary user groups.
As root, change your security settings to normal (desktop system used to surf internet).
Unless you are running a server, I don't think you need it set higher than that.
I finally found what the problem was: my /home partition was full!
If only I got a simple error message from kde on this, I would not have s*cked for two days with such a foolish thing.
This makes me remember a case with Open Office: I edited and saved several documents to a samba network share that happened to be full. I did not get a simple error message (like this time) from OO, it all seemed like my documents were saved. In fact, all of my documents (a whole day's work) were lost when I closed OO.
I do not know why is it so hard for kde or for OO to warn me: hey fool, you are out of space!