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, I get some errors when running the program.

Here is a transcript of parts of the log:
Code:
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
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 Xserver-related, but honestly I don't know much of these things