Xorg problem after update

[Kenneth Brun Nielsen]

I run a program (Cadence IC6, which is Qt-based) on a remote machine
through SSH with X11 forwarding.

After updating my client machine from Fedora17 to Fedora19 64-bit (X
version is 1.14.2-9, I believe - or please advice how I can check), I get
some errors when running the program.

Here is a transcript of parts of the log:
--
Xlib: sequence lost (0x107f2 > 0x19ab) in reply type 0x0!
    libManager Qt Warning: X Error: 0 0
    Major opcode: 113 (X_KillClient)
    Resource id: 0x18b0000
    Xlib: sequence lost (0x10000 > 0x19ab) in reply type 0x0!
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0xff7ff87f
    Xlib: sequence lost (0x10000 > 0x19ac) in reply type 0x2!
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    Xlib: sequence lost (0x10000 > 0x19b3) in reply type 0x0!
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    libManager Qt Warning: X Error: 0 0
    Major opcode: 0 ()
    Resource id: 0x0
    Xlib: sequence lost (0x1411c > 0x19b3) in reply type 0x1c!
    Xlib: sequence lost (0x1230f > 0x19b3) in reply type 0xf!
    Xlib: sequence lost (0x10201 > 0x19b3) in reply type 0x1!
    libManager Qt Warning: Qt-subapplication: Fatal IO error: client killed
--

Also it is reflected in the dmesg of the server:
"libSelect[27710]: segfault at 0000000000000000 rip 00000000081db391 rsp
00000000ffba5380 error 4"


Well, any idea why I get these errors? And how I can debug or get rid of
them? I assume the problem is either Qt- or X-related, but honestly I don't
know much of these things.

Can it be a bug in X? Notice, that everything worked fine, when I was using
Fedora 17, so a change in Fedora 19 (X or Qt) provoked the error. Also
notice, that I'm not a developer and have close to no insight into X (might
be obvious from the above:)).

Any suggestions will be appreciated.

FYI, I also posted here (several days ago - still no answers):
http://forums.fedoraforum.org/showthread.php?t=293621
http://qt-project.org/forums/viewthread/31831/
http://www.cadence.com/community/forums/T/27151.aspx

Best regards,
Kenneth
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