Yes Wysota I did... I am a little bit lost in that, here what I found:

I have :

1) QT 4.1.1 + minGW32 on a XP SP2 machine
2) QT 4.1.1 + gcc 3.3.5 + Xfree86 on a Debian machine with 2.4.31 Kernel
3) QT 4.1.1 + gcc 3.4.5 +Xorg on a Kubuntu with 2.6.12-9 Kernel
4) QTopia core 4.1.1 + gcc 3.3.5 plus FrameBuffer driver on a Debian machine with 2.4.31 kernel

Using the code just above here are the results :

1) work perfectly, no bug
2) seg fault when trying to do a right click/ delete a directory
3) works perfectly, no bug
4) seg fault when trying to do a right click/ delete a directory

So, using 2.4.31 Kernel with gcc 3.3.5 might be the cause, I dont know its far beyond my expertise, but I think there is something incompatible between QT4.1.1/QTopia and the 2.4.31 and GCC 3.3.5.

So does someone has any idea ?