I've recently upgraded to 6.1.3 and I am noticing some strange behaviour with the copyright notice at the bottom of the site.  I noticed that the copyright notice was outdated (still showing 2010 even though I had changed the copyright to 2011 sometime last year).  I don't think it had to do with the upgrade, I just noticed it afterwards.

i went from 5.6.1 to 5.6.7 to 6.0.2 to 6.1.3 with no errors and all seems well (Updated all modules also).  I went in and changed the copyright notice to blank which should show the notice as Copyright (c) 2012 Site Name.  This works for some users, however it does change back and forth depending who is logged in or not.  I have tested this across different browsers and computer, cleared cache, and restarted the application.

For example, on one machine, the following is seen:

• In IE9, not logged in, shows old 2010 copyright notice.
• in IE9, logged in as host, shows old 2010 copyright notice
• in IE9, logged in as Portal Admin, shows the new 2012 notice.
• in IE9, logged in as ordinary user, shows the new 2012 notice
• in FF10, not logged in, the new 2012 notice is shown.
• in FF10, logged in as host, shows old 2010 notice
• in FF10, logged in as Portal Admin, shows new 2012 notice
• in FF10, logged in as ordinary user, shows new 2012 notice

i did try a different machine, however it had also accessed the site as a particular user (admin i believe) and the old 2010 notice showed up.  I will try clearing that information out and see what happens.