I have been trying to port Inkscape to SGI IRIX platform using MIPSpro compiler. It is running now except that some menu entries kill it. [...] I have made a page describing the problems at
http://s92957900.onlinehome.us/is_mips/inkscape_mipspro.html
Your problem might be your compiler, esp. the RTTI emulation which apparently is in the directory /j10/mtibuild/v743m/workarea/v7.4.3m/libC/lang_support/rtti.cxx
This is visible as the last frames of the swatches and aboutbox backtraces, and is caused by a dynamic_cast in the Gtkmm code.
To test the hypothesis, gcc would have to be compiled on your machine.
If I were you I would use gcc anyway, as there are surely more such things to come if you use all those libraries built for a gcc-based environment.
ralf