This backtrace does not contain useful information. Please try it out with the KDE 4 version of KRDC and tell me if you still can reproduce.

I can't repruduce the crash with KRDC 4, but if i connect with VNC, i can't use the 'Alt Gr' key on my hungarian keyboard. Connection with RDP is ok.

Ok, can you please try if you can reproduce this behavior all the time? Does it help if you change your keyboard layout? Please provide as much useful information as possible here. Thanks.

I can reproduce this bug anytime.
It doesn't help, if I change the keyboard layout. 
I tried German layout, there is an AltGr button too.

Here are some keys with Hungarian layout locale:
íyxcvbnm,.-űáé
The same keys if i push AltGr locale:
<>#&@{}<;>*¤ß$
The same keys with AltGr remote:
myxcvbnm,y-űáé
German locale:
|«»¢“”nµ─·
German remote:
w   77n77 7 

My keyboard settings:
$ setxkbmap -print
xkb_keymap {
        xkb_keycodes  { include "xfree86+aliases(qwertz)"       };
        xkb_types     { include "complete+numpad(microsoft)"    };
        xkb_compat    { include "complete"      };
        xkb_symbols   { include "pc+de+level3(ralt_switch)+eurosign(e)" };
        xkb_geometry  { include "pc(pc105)"     };
};

I have a workaround discovered:
If I press remote Alt + Ctrl + <key>, 
it behaves as i would press AltGr + <key>

I cannot reproduce this issue here. Also, KRDC just uses Qt methods to get the keys which are pressed.. Are you sure Alt Gr works in other Qt apps (KDE apps)?

Yes AltGr works with Parley and with other KDE4 applications too. KRDC4 works also if I connect with RDP, only VNC has this bug.

i use an american keyboard, and kde4-krdc op opensuse 11, and i get the same messages:
System configuration startup check disabled.

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[Thread debugging using libthread_db enabled]
[New Thread 0xb6a57b50 (LWP 22641)]
[New Thread 0xb667bb90 (LWP 22654)]
[New Thread 0xb3e2cb90 (LWP 22652)]
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0xffffe430 in __kernel_vsyscall ()
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb71aac15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb6ae4067 in ?? () from /usr/lib/libxcb.so.1
#3  0xb6ae5004 in xcb_send_request () from /usr/lib/libxcb.so.1
#4  0xb70c43c6 in _XPutXCBBuffer () from /usr/lib/libX11.so.6
#5  0xb70c4790 in ?? () from /usr/lib/libX11.so.6
#6  0xb71c284e in XShmPutImage () from /usr/lib/libXext.so.6
#7  0x0807dcfd in ?? ()
#8  0x08074b6d in ?? ()
#9  0x08074db7 in ?? ()
#10 0xb747e8f6 in QObject::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#11 0xb74b91fc in QWidget::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#12 0xb74193cd in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#13 0xb741a37d in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0xb7b08892 in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#15 0xb741b4ea in QApplication::sendPostedEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#16 0xb741b646 in QApplication::sendPostedEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#17 0xb73c3c75 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0xb7431d10 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#19 0xb7431ba6 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#20 0xb7419a5f in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#21 0x0807050f in ?? ()
#22 0xb6e635f5 in __libc_start_main () from /lib/libc.so.6
#23 0x08058d71 in ?? ()

SVN commit 841060 by uwolfer:

Correctely respect key modifiers in VNC.
Patch by Guillaume Pothier, thanks a lot!
BUG:168015
BUG:162865
(#162865: fixes KDE 4 issues, other issues listed there are already fixed in KDE 4)

 M  +39 -10    vncview.cpp  
 M  +1 -0      vncview.h  


WebSVN link: http://websvn.kde.org/?view=rev&revision=841060

SVN commit 841061 by uwolfer:

Backport:
SVN commit 841060 by uwolfer:

Correctely respect key modifiers in VNC.
Patch by Guillaume Pothier, thanks a lot!
CCBUG:168015
CCBUG:162865
(#162865: fixes KDE 4 issues, other issues listed there are already fixed in KDE 4)

 M  +39 -10    vncview.cpp  
 M  +1 -0      vncview.h  


WebSVN link: http://websvn.kde.org/?view=rev&revision=841061