I recently upgraded an RT installation from 3.4.5 to 4.0.7, in parallel to the original installation, and am still testing RT 4.0.
In general things look good now, but I receive this warning in the Apache2 error.log when I select the Modify people option for a ticket. For example, (http://10.20.30.40/rt4/Ticket/ModifyPeople.html?id=12345) (real IP address obscured...) [Fri Apr 12 21:34:10 2013] [warning]: Use of uninitialized value $Text::Template::GEN5::comment in substitution (s///) at template line 1. (template:1) The 'GENnn' part of the message is variable, but 'nn' is always observed to be a sequentially increasing multiple of 5. (0, 5, 10, etc.) What could I do to track this down further? Ken