It keeps happening on my machine.
I have a folder synchronized by ubuntu one, I wanted to share a sub-folder with my friend. I've right-clicked on that folder, selected Ubuntu One -> Share
Nautilius crashes with the following backtrace:
#0 0x00007ffff43468f0 in g_str_hash () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1 0x00007ffff4345f73 in g_hash_table_lookup () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007fffd45c2c9b in add_contacts (search_string=0x16f84b0 "", selection_hash=0x137d460,
contacts=<optimized out>, cv=0x1707060) at contacts-view.c:384
#3 got_contacts_cb (book=<optimized out>, status=<optimized out>, contacts=<optimized out>,
user_data=0x14d2780) at contacts-view.c:468
#4 0x00007fffd438e45c in ?? () from /usr/lib/libebook-1.2.so.12
#5 0x00007ffff48c591d in g_simple_async_result_complete ()
from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6 0x00007ffff48c5a4c in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7 0x00007ffff4355dda in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8 0x00007ffff43561a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff4356264 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff48f3864 in g_application_run () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#11 0x000000000042b969 in main (argc=1, argv=0x7fffffffe538) at nautilus-main.c:101
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubuntuone-client-gnome 2.99.90-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Mon Mar 12 20:07:26 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120218)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, user)
LANG=pl_PL.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntuone-client-gnome
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
DistroRelease: Ubuntu 12.04
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120218)
Package: ubuntuone-client-gnome 2.99.91-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, user)
LANG=pl_PL.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Tags: precise
Uname: Linux 3.2.0-19-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo
John, assigned to you because I'm not sure what team to assign to. Please reassign as appropriate.