This is hard to get a debug from nautilus, but I know when it happens. Now I'm working on upgrade packages and I use uscan for update. After download .tar.gz uscan create a symlink to .tar.gz file. If I'll open any archive (not different a symlink or source .tar.gz) by file-roller, drag and drop to nautilus and... nautilus crashed.
This is hard to get a debug from nautilus, but I know when it happens. Now I'm working on upgrade packages and I use uscan for update. After download .tar.gz uscan create a symlink to .tar.gz file. If I'll open any archive (not different a symlink or source .tar.gz) by file-roller, drag and drop to nautilus and... nautilus crashed.