Opening inter-notebook links produces extra entries in system tray

When I click an inter-notebook link (in this wiki syntax: "notebook2?page1") the page is opened in a new window, even though the notebook in question is already opened. Also, a new entry is added to the notebook list in the system tray. The text for this extra entry has this format "file:///<location of notebooks>/notebook2?page1".

Info:
Zim 0.49
OS: Ubuntu 10.10 and RHEL 6 (both x86-64)
I attach a screenshot of the system tray.

Debug info about versions:
christian@ubuntuPC:~$ zim -D
INFO: This is zim 0.49
DEBUG: Python version is (2, 6, 6, 'final', 0)
DEBUG: Platform is posix
DEBUG: Zim revision is:
 branch: pyzim-trunk
 revision: 321 <email address hidden>
 date: 2010-11-02 21:14:14 +0100

and

DEBUG: Gtk version is (2, 22, 0)
DEBUG: Pygtk version is (2, 21, 0)

Here's some debug output, when opening the link:
DEBUG: Loading /home/christian/.config/zim/style.conf
DEBUG: Loaded plugin attachmentbrowser (<AttachmentBrowserPlugin object at 0x156a550 (zim+plugins+PluginClass at 0x15a9680)>)
DEBUG: Registered plugin <InsertDiagramPlugin object at 0x157c140 (zim+plugins+PluginClass at 0x15a4840)> for image type "diagram"
DEBUG: Loaded plugin diagrameditor (<InsertDiagramPlugin object at 0x157c140 (zim+plugins+PluginClass at 0x15a4840)>)
DEBUG: Registered plugin <InsertEquationPlugin object at 0x157c780 (zim+plugins+PluginClass at 0x15a96e0)> for image type "equation"
DEBUG: Loaded plugin equationeditor (<InsertEquationPlugin object at 0x157c780 (zim+plugins+PluginClass at 0x15a96e0)>)
DEBUG: Loaded plugin inlinecalculator (<InlineCalculatorPlugin object at 0x1587230 (zim+plugins+PluginClass at 0x15ba240)>)
DEBUG: Loaded plugin linkmap (<LinkMapPlugin object at 0x1587320 (zim+plugins+PluginClass at 0x15ba760)>)
DEBUG: Loaded plugin printtobrowser (<PrintToBrowserPlugin object at 0x187d140 (zim+plugins+PluginClass at 0x15ba460)>)
DEBUG: Loaded plugin tasklist (<TaskListPlugin object at 0x187d5f0 (zim+plugins+tasklist+TaskListPlugin at 0x15df4e0)>)
DEBUG: Sending to daemon: ["ping",[],{}]

DEBUG: Daemon replied: "Ack"
DEBUG: Sending to daemon: ["vivicate",["zim.plugins.trayicon.AppIndicatorTrayIcon","TrayIcon"],{}]

DEBUG: Daemon replied: true
DEBUG: Loaded plugin trayicon (<TrayIconPlugin object at 0x187daf0 (zim+plugins+PluginClass at 0x13b3120)>)
DEBUG: Accelmap: /home/christian/.config/zim/accelmap
DEBUG: Opening notebook: file:///home/christian/Dropbox/.notes/SIMAIR?BUM 2008
DEBUG: Loading /home/christian/Dropbox/.notes/SIMAIR/notebook.zim
DEBUG: Cache dir: /home/christian/Dropbox/.notes/SIMAIR/.zim
DEBUG: Index database file: /home/christian/Dropbox/.notes/SIMAIR/.zim/index.db
DEBUG: Loading /home/christian/Dropbox/.notes/SIMAIR/.zim/state.conf
INFO: Starting background index update
DEBUG: Action: set_pathbar_recent
INFO: Open page: <FileStorePage: BUM 2008> (<Path: BUM 2008>)
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/zim/plugins/attachmentbrowser.py", line 677, in on_open_page
    self.set_current_folder(str(self.plugin.ui.notebook.get_attachments_dir(page)+os.sep))
  File "/usr/lib/pymodules/python2.6/zim/plugins/attachmentbrowser.py", line 604, in set_current_folder
    if (self.plugin.uistate['active']):
KeyError: 'active'
DEBUG: Wrote /home/christian/.config/zim/preferences.conf
INFO: Index update done