Ralf, this is a compicated matter, the backtrace is probably misleading.
I had this error with different versions from Suse and also with a 0.43+devel (Jan 27 2006) compiled on my host I run it under Gnome and i dont have the problematic KDE Baghira theme and the package gtk_qt_engine installed.
For the record, I have OpenSuSE 10.1 but inkscape worked with 10.0 here, too, under KDE, Gnome, and now under wm/AfterSTEP. However, there are more crash reports from RPM based systems than from Debian-based systems, so there must be some unsolved problem(s) on these systems.
There are still some possibilities for you, though. Because the last line in your backtrace is in libstdc++6, you could try to compile that and all other C++ libs needed (libsigc++,glibmm, gtkmm) with the same compiler as you use for inkscape. This problem (not the same g++ used) occurs frequently, and esp. recently.
Somewhat less laborious would be to get a backtrace from valgrind3, after you have done 'export _INKSCAPE_GC=disable'. valgrind is better in catching the right moment for the backtrace, so to speak.
Hope this helps, ralf