Description of problem:
I use eric as python IDE. On Fedora 16 every time when I open a window in eric, I see this message:

Warning:
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 20 (X_GetProperty)
Resource id: 0x8e00278

I'm send (eric4-bugs.org) this information with attached debug info, generated by eric to maintainer and get this answer: "That is not an eric issue. I guess, it is related to Qt. It could be related
to using Qt 4.8 with PyQt4, which is a not yet supported combination."

If this not an eric issue, this is an Fedora issue, so I posted bug there.

debuginfo generated by eric4:

Version Numbers:
 Python 2.7.2
 KDE 4.7.2
 PyKDE 4.0.2
 Qt 4.8.0
 PyQt4 4.8.4
 sip 4.12.4
 QScintilla 2.5.1
 eric4 4.4.14 (r4014)

Platform: linux2
2.7.2 (default, Jul  8 2011, 18:54:13)
[GCC 4.6.1 20110627 (Red Hat 4.6.1-1)]
----
Plugins Version Numbers:
 PluginAbout 4.4.0
 PluginEricapi 4.4.0
 PluginEricdoc 4.4.0
 PluginSyntaxChecker 4.4.0
 PluginTabnanny 4.4.0
 PluginVcsPySvn 4.4.0
 PluginVcsSubversion 4.4.0
 PluginVmListspace 4.4.0
 PluginVmMdiArea 4.4.0
 PluginVmTabview 4.4.0
 PluginVmWorkspace 4.4.0
 PluginWizardPyRegExp 4.4.0
 PluginWizardQColorDialog 4.4.0
 PluginWizardQFileDialog 4.4.0
 PluginWizardQFontDialog 4.4.0
 PluginWizardQInputDialog 4.4.0
 PluginWizardQMessageBox 4.4.0
 PluginWizardQRegExp 4.4.0
----
Distribution Info:
 /etc/fedora-release
 Fedora release 16 (Verne)

 /etc/system-release
 RFRemix release 16 (Verne)

 /etc/rfremix-release
 RFRemix release 16 (Verne)

 /etc/redhat-release
 RFRemix release 16 (Verne)

Version-Release number of selected component (if applicable):
 eric4 4.4.14 (r4014)

How reproducible:
every time

Steps to Reproduce:
1. On fedora 16 install eric4 by "sudo yum install eric"
2. run him, open any file and do any job with him. Error message will shown.
3.
  
Actual results:
error window

Expected results:
work fine

Additional info: