All pull-down menu disappear in an instant

Bug #1174966 reported by arborvitae
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
firefox (Ubuntu)
New
Undecided
Unassigned

Bug Description

Right click menu and menus on menu bar displayed momentarily.
But they disappears in an instant.

Step to reproduce: Unknown

'lsb_release -rd':
Description: Ubuntu 13.04
Release: 13.04

'apt-cache policy pkgname':
firefox:
  Installed: 20.0+build1-0ubuntu2
  Candidate: 20.0+build1-0ubuntu2
  Version table:
 *** 20.0+build1-0ubuntu2 0
        500 http://jp.archive.ubuntu.com/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status

description: updated
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