Bug 736952

Works for me. You seem to have a binary-incompatible Qt (an old version bundled with some proprietary application?) in your library path.

Can you please post the output of:
rpm -q qt qt-x11
and of:
ldd /usr/bin/avogadro
?

in fact , i can run avogadro on my netbook with fedora 15 X86_64 so the problem comes to my desktop PC installation ...

the return of your command :

 [root@sancy ~]# rpm -q qt qt-x11
qt-4.7.3-8.fc15.x86_64
qt-4.7.3-8.fc15.i686
qt-x11-4.7.3-8.fc15.x86_64
qt-x11-4.7.3-8.fc15.i686
[root@sancy ~]# ldd /usr/bin/avogadro
	linux-vdso.so.1 =>  (0x00007fff41c8f000)
	libc.so.6 => /lib64/libc.so.6 (0x0000003a95800000)
	libopenbabel.so.4 => /usr/lib64/libopenbabel.so.4 (0x0000003aa3000000)
	libQtOpenGL.so.4 => /usr/lib64/libQtOpenGL.so.4 (0x0000003ad9c00000)
	libQtGui.so.4 => /usr/lib64/libQtGui.so.4 (0x0000003ad5000000)
	libQtNetwork.so.4 => /usr/lib64/libQtNetwork.so.4 (0x0000003a9e600000)
	libQtCore.so.4 => /usr/lib64/libQtCore.so.4 (0x0000003a9dc00000)
	libavogadro.so.1 => /usr/lib64/libavogadro.so.1 (0x000000356cc00000)
	libGLU.so.1 => /usr/lib64/libGLU.so.1 (0x0000003aa6600000)
	libGL.so.1 => /usr/lib64/nvidia/libGL.so.1 (0x0000003ab1000000)
	libSM.so.6 => /usr/lib64/libSM.so.6 (0x0000003aa1800000)
	libICE.so.6 => /usr/lib64/libICE.so.6 (0x0000003aa1c00000)
	libX11.so.6 => /usr/lib64/libX11.so.6 (0x0000003a98c00000)
	libXext.so.6 => /usr/lib64/libXext.so.6 (0x0000003a99800000)
	libGLEW.so.1.5 => /usr/lib64/libGLEW.so.1.5 (0x0000003a9a400000)
	libpython2.7.so.1.0 => /usr/lib64/libpython2.7.so.1.0 (0x0000003aa7400000)
	libboost_python-mt.so.1.46.0 => /usr/lib64/libboost_python-mt.so.1.46.0 (0x0000003a9c400000)
	libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003a9cc00000)
	libm.so.6 => /lib64/libm.so.6 (0x0000003a95c00000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003a97000000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003a96000000)
	/lib64/ld-linux-x86-64.so.2 (0x0000003a95400000)
	libdl.so.2 => /lib64/libdl.so.2 (0x0000003a96400000)
	libz.so.1 => /lib64/libz.so.1 (0x0000003a96800000)
	libfreetype.so.6 => /usr/lib64/freetype-freeworld/libfreetype.so.6 (0x0000003ad3000000)
	libXi.so.6 => /usr/lib64/libXi.so.6 (0x0000003a9b800000)
	libXrender.so.1 => /usr/lib64/libXrender.so.1 (0x0000003a9ac00000)
	libXrandr.so.2 => /usr/lib64/libXrandr.so.2 (0x0000003a9b400000)
	libXfixes.so.3 => /usr/lib64/libXfixes.so.3 (0x0000003a9c800000)
	libXcursor.so.1 => /usr/lib64/libXcursor.so.1 (0x0000003a9c000000)
	libXinerama.so.1 => /usr/lib64/libXinerama.so.1 (0x0000003a9bc00000)
	libfontconfig.so.1 => /usr/lib64/libfontconfig.so.1 (0x0000003ad2c00000)
	libgthread-2.0.so.0 => /lib64/libgthread-2.0.so.0 (0x0000003a97c00000)
	librt.so.1 => /lib64/librt.so.1 (0x0000003a96c00000)
	libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x0000003a97800000)
	libpng12.so.0 => /usr/lib64/libpng12.so.0 (0x0000003a99c00000)
	libgobject-2.0.so.0 => /lib64/libgobject-2.0.so.0 (0x0000003a98400000)
	libssl.so.10 => /usr/lib64/libssl.so.10 (0x0000003aa2000000)
	libcrypto.so.10 => /lib64/libcrypto.so.10 (0x0000003aa1400000)
	libnvidia-tls.so.280.13 => /usr/lib64/nvidia/tls/libnvidia-tls.so.280.13 (0x0000003ab0000000)
	libnvidia-glcore.so.280.13 => /usr/lib64/nvidia/libnvidia-glcore.so.280.13 (0x0000003aad000000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x0000003a9f800000)
	libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x0000003a99000000)
	libutil.so.1 => /lib64/libutil.so.1 (0x0000003aa9a00000)
	libexpat.so.1 => /lib64/libexpat.so.1 (0x0000003a99400000)
	libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x0000003aa1000000)
	libkrb5.so.3 => /lib64/libkrb5.so.3 (0x0000003aa0000000)
	libcom_err.so.2 => /lib64/libcom_err.so.2 (0x0000003a9fc00000)
	libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x0000003aa0c00000)
	libXau.so.6 => /usr/lib64/libXau.so.6 (0x0000003a98800000)
	libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x0000003aa0800000)
	libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x0000003aa0400000)
	libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003a98000000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003a97400000)
[root@sancy ~]#

Assuming you normally run Avogadro as nauton, not as root, please also run the ldd command as nauton. (LD_LIBRARY_PATH can be set per user.)

I have removed qt-4.7.3-8.fc15.i686 and qt-X11-4.7.3-8.fc15.i686, and it works now...
yes as you write in the previous mail, it was not working in my session too.
i have made the different command in my session and on root session.

I have a little trouble believing that to remove programs as qt for i686 change something, but it works, so thanks to have spend time for my problem.

regards

qt.i686 cannot possibly be the true source of the problem. But whatever, if it works for you now, we can keep this closed, it was definitely something on your machine.