[lubuntu] icon errors after upgrade

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http://ubuntuforums.org – hello everybody after upgrading lubuntu from 12.04 to 12.10, i'm having some strange issues with icons visualization. in the desktop, some icons are transparent: in file manager, some icons simply don't appear this happens at any place where icons should appear (including the start menu) i tried changing icon themes, with no success :( i'm really unlucky with Linux... #-o any help is apreciated. thanks in advance. (Hardware)