menu did not work when libreoffice open files

[孙渊汇]

when I open an exist file (not from the libreoffice File>Open item) , some time the globel menu disappear and every time even if the menu exist the menu item such as "exit","save", "save as", did not work, but it can work when i use shortcuts.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: libreoffice (not installed)
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Sun Oct 21 22:13:12 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
ProcEnviron:
 LANGUAGE=zh_CN:zh
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=zh_CN.UTF-8
 SHELL=/bin/bash
SourcePackage: libreoffice
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Luigi Pezzotta (sunshadow86)]

I think these are actually two bugs, however they both affect me as well.

- when I open an existing document, no menu bar appears on top. If I select another window (e.g. Chromium) and then return to Libreoffice, the menu appears (maybe a duplicate of https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1067282).

- after using any option from the global menu once, the global menu stops working. Options are still visible and apparently selectable, but they don't actually work any more. This renders the program almost unusable for me; is there any workaround?

I couldn't find the second bug listed by its own.