Last modified: 2009-02-19 21:58:58 UTC
1. Delete all *.wikipedia.org related cookies
2. Login with a non unified username
3. Logout again. You will see the standard success message plus 'Logging you out from Wikimedia's other projects:' plus placeholders from the browser for missing images (the project icons)
Recently-introduced similar bug fixed in r47518.
Unable to reproduce as reported.