Disk list won't show in nautilus

1)
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04
2)
gvfs:
  Installed: 1.24.0-1ubuntu1
  Candidate: 1.24.0-1ubuntu1
  Version table:
 *** 1.24.0-1ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status
3) I just copied some files from internal hard to my flash, then minimize the copying window
4) In nautilus left column all my disks had vanished except 'Computer' which still remain.

note: the problem fixed when i entered my flash place manually.

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: gvfs-daemons 1.24.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-13.13-generic 3.19.3
Uname: Linux 3.19.0-13-generic x86_64
ApportVersion: 2.17-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 13 15:28:36 2015
ExecutablePath: /usr/lib/gvfs/gvfs-udisks2-volume-monitor
InstallationDate: Installed on 2015-04-08 (4 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcCmdline: /usr/lib/gvfs/gvfs-udisks2-volume-monitor
ProcEnviron:
 XDG_RUNTIME_DIR=<set>
 SHELL=/bin/bash
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SegvAnalysis:
 Segfault happened at: 0x4119a4: mov 0x18(%rax),%rdi
 PC (0x004119a4) ok
 source "0x18(%rax)" (0x645f6b636f6c6247) not located in a known VMA region (needed readable region)!
 destination "%rdi" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gvfs
StacktraceTop:
 ?? ()
 g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
Title: gvfs-udisks2-volume-monitor crashed with SIGSEGV in g_simple_async_result_complete()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo