AMHO you have... an error. Well OK, more seriously : please launch Inkscape from the command line and then post the result here (copy-paste or another way). Maybe errors are readable in it.
Emergency save activated! Emergency save completed. Inkscape will close now. If you can reproduce this crash, please file a bug at www.inkscape.org with a detailed description of the steps leading to the crash, so we can fix it.
(inkscape:2427): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread Segmentation fault