Dear buddy,
I think that the problem is due to a global variable (type KGlobale) that isn't inizialized from the system. This problem is one KDE bug, that isn't fixed. This fact is reported from various Linux newsgroups in no-programming tasks, so the problem isn't caused from a programming error.

I verify that this warning occurs when I use, for the 1st time, one object of type QDialog, during programming with QtCreator. While I working in no-programming environment, it doesn't occur.

If anyone have other information on this problem, I pray him to share his information.