Context menu disappears in mail/news--news about OSXilla problem

I have got the following javascript errors when I right-click in a message:

Error: getWebNavigation is not defined
Source File: chrome://multiviews/content/multizillaContextMenuOverlay.xul
Line: 54


and

Error: gContextMenu has no properties
Source File: chrome://multiviews/content/multiviewsContextMenuOverlay.js
Line: 50 and the context menu does not appear


Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6b) Gecko/20031124 
MultiZilla/1.5.0.4e

w/o multizilla, I don't have this behaviour. The context menu appears 
cleanly.

May I fill a bug ?

About my problem with OSXilla :

Moz 1.5 multizilla 1.5.04c used to crash with a -255 error code, if i 
remember well and
now, with this version it still crashes aned i have got a -11 error code 
(anyway it might have been another code than 255 but it was not 11 anyway.

I got one or two times of a different behaviour:

Some parts of mozilla windows appeared sometimes with OSXilla theme but 
they vanished (it was square parts of the windows)


Here is the installation log (multizilla, googlebox and OSXilla):
MultiZilla v1.5.0.4 (version 1.5.0.4) hope it helps...
     -------------------

     ** Installation of MultiZilla v1.5.0.4 in directory: 
/root/.mozilla/default/pfui7622.slt/
     ** initInstall: 0
     ** InstallType: single-user installation
     ** Installation init : Ok
     ** Installation started for a *nix/Mac platform
     [1/9]    Deleting file: /usr/local/mozilla/components/compreg.dat
     [2/9]    Replacing: /root/.mozilla/default/pfui7622.slt/multiviews.jar
     [3/9]    Installing: /usr/local/mozilla/defaults/pref/all-mz.js
     [4/9]    Installing: /usr/local/mozilla/defaults/profile/multizilla.rdf
     [5/9]    Installing: /usr/local/mozilla/components/mzUpdateNotifier.js
     [6/9]    Register Package: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/content/multiviews/
     [7/9]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/skin/modern/multiviews/
     [8/9]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/skin/classic/multiviews/
     [9/9]    Register Locale: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/locale/en-US/multiviews/

     Install completed successfully  --  11/26/2003 00:47:42

-------------------------------------------------------------------------------
http://multizilla.mozdev.org/xpi/multiviews-v1504.xpi  --  11/26/2003 
00:56:42
-------------------------------------------------------------------------------

     MultiZilla v1.5.0.4 (version 1.5.0.4)
     -------------------

     ** Installation of MultiZilla v1.5.0.4 in directory: 
/root/.mozilla/default/pfui7622.slt/
     ** initInstall: 0
     ** InstallType: single-user installation
     ** Installation init : Ok
     ** Installation started for a *nix/Mac platform
     [1/9]    Deleting file: /usr/local/mozilla/components/compreg.dat
     [2/9]    Replacing: /root/.mozilla/default/pfui7622.slt/multiviews.jar
     [3/9]    Replacing: /usr/local/mozilla/defaults/pref/all-mz.js
     [4/9]    Replacing: /usr/local/mozilla/defaults/profile/multizilla.rdf
     [5/9]    Replacing: /usr/local/mozilla/components/mzUpdateNotifier.js
     [6/9]    Register Package: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/content/multiviews/
     [7/9]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/skin/modern/multiviews/
     [8/9]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/skin/classic/multiviews/
     [9/9]    Register Locale: 
jar:file:///root/.mozilla/default/pfui7622.slt/multiviews.jar!/locale/en-US/multiviews/

     Install completed successfully  --  11/26/2003 00:56:44

-------------------------------------------------------------------------------
http://multizilla.mozdev.org/xpi/googlebox/googlebox-v13.xpi  --  
11/26/2003 01:16:12
-------------------------------------------------------------------------------

     GoogleBox version 1.3 (version 1.3)
     ---------------------

     ** initInstall: 0
     ** InstallType: single-user installation
     ** Initializing installation : Ok
     ** Installation started for a *nix/Mac platform
     [1/5]    Replacing: /root/.mozilla/default/pfui7622.slt/googlebox.jar
     [2/5]    Register Content: 
jar:file:///root/.mozilla/default/pfui7622.slt/googlebox.jar!/content/googlebox/
     [3/5]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/googlebox.jar!/skin/classic/googlebox/
     [4/5]    Register Skin: 
jar:file:///root/.mozilla/default/pfui7622.slt/googlebox.jar!/skin/modern/googlebox/
     [5/5]    Register Locale: 
jar:file:///root/.mozilla/default/pfui7622.slt/googlebox.jar!/locale/en-US/googlebox/

     Install completed successfully  --  11/26/2003 01:16:19