Non existent icon file for 'Power distribution unit' object
Administration->Global settings->Object type configuration->Infrastructure->Power distribution unit->"Icon"
contains the value "pdu.gif".
This file does not exist. That messes up the layout of Rack (front/back) view.
I changed the value of the "Icon" field to "images/icons/silk/lightning.png" to fix the problem.
This bug is present in the pro version.
the icon "pdu.gif" should be inside the "<i-doit>/images/tree/" directory. Is it possible that the icon is missing in your setup / update package? If so - which version are you currently running?
Greetings from Düsseldorf</i-doit>