Yesterday I logged out and stopped the system normally as usual, and look what happened: today I cannot log into kde with my username and password!

There are no error messages or something when I try, I am just always kicked back to the xdm login window after some seconds.
It is SuSe 9.0 and the kde version (I think 3.0?) that comes with it.

How to check what is wrong? Is there a kde logfile somewhere?

Can you log in with other window managers???

If not, did you increase your security level while you were in your last session???

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.

But what is it then?

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!

I am highly frustrated by this event.

Anyway, thanks for your attention!