Bug 473758

* Are you sure you're running the Qt 4 Designer and not the Qt 3 one? (Help/About will tell you.)
* What theme are you trying to use? Can you identify what theme Qt Designer is actually using? (If so, what is it using?)
* Do you have a widgetStyle4= line in your .kde/share/config/kdeglobals file in your home directory? (Normally you shouldn't have one unless you added one, it's a special workaround we added to make it possible to set different themes for KDE 3 and 4. But double-checking can't hurt. If the file or directory doesn't exist at all, that's OK too.)
* Do you perhaps have a private copy of Qt in some application directory? Some proprietary applications, e.g. Nessus, are known to ship their own private copy of Qt which conflicts with the system copy.
* Related to the previous question, are you sure the Qt Designer you're using is a 64-bit version? (Try "which designer-qt4" to see what copy is being run and rpm -q qt-devel to make sure it's a x86_64 version.) (Using styles in 32-bit apps only works if you have the 32-bit version of the style.)

* Yes, it is Qt4 designer for sure, I checked.
* It doesn't mater. At startup designer looks the same with all themes. It only changes looks (and make menu text appear) only when I change/resave theme in qtconfig-qt4 while designer is running.
*I don't have such line in that file.
*No, I don't have such copies.
*Yes, I'm sure. I even launched 64 bit version directly (/usr/lib64/qt4/bin/designer-qt4 instead of /usr/bin/designer/qt4) but result is the same.

Finally, here's designer output on startup:
QMetaProperty::read: Unable to handle unregistered datatype 'QList<QChar>' for property 'KCharSelect::displayedChars'
QMetaProperty::read: Unable to handle unregistered datatype 'QList<QColor>' for property 'KColorCombo::colors'
Error while reparenting!
QMetaProperty::read: Unable to handle unregistered datatype 'KUrl' for property 'KUrlRequester::url'
QMetaProperty::read: Unable to handle unregistered datatype 'KFile::Modes' for property 'KUrlRequester::mode'
QMetaProperty::read: Unable to handle unregistered datatype 'KUrl' for property 'KUrlRequester::url'
QMetaProperty::read: Unable to handle unregistered datatype 'KFile::Modes' for property 'KUrlRequester::mode'

Hmmm, maybe it's honoring the KDE 4 settings over the Qt 4 ones? Try setting the style in KDE's systemsettings rather than in qtconfig-qt4.

You were right. After logging to KDE and setting it's theme manually, qt4 designer always starts normally in both KDE and GNOME. Thank you!

Ok, tested with all KDE themes. Bug only present with oxygen theme, others work fine. KDE bug?

So what is the actual bug? The fact that the theme setting in systemsettings takes precedence over the one in qtconfig-qt4 is expected.

I think the component should be changed to something in KDE (I'm not sure what), it looks like oxygen theme bug.

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