Sharepoint 2007 navigation error "page has been modified by another author"

It has been logged as a bug.

1- Go to Navigation and make a list of libraries that have been corrupted. (Look in the 'Selected Item' box at the bottom under Navigation and check the URL. Don't try save, just click Cancel.

2- Click on the document libraries in question, then Settings, Document Library or List Settings, Title Description and Navigation. Change the display on quick launch to No.

3- Open SharePoint Designer and go to the web site view. At the bottom of the website view screen, choose the Navigation option. Delete the main document libraries. Save and exit.

4- On your SharePoint site, go to View All Site Content, click on the unlinked document libraries from step 2 and relink them to the quick launch.