IE 11 some favicons stopped working

IN IE 11 some of my favicon links have stopped working. The ones that have an individualised icon logo for the site all work. Many have a generic internet explorer icon. Of these some work and some of them have stopped working (in the past 24 hours). I have system restored back 2 weeks but this didn't restore their functionality.

Is there any way of getting them working?
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell Inspiron 580
    Memory
    8Gb
    Hard Drives
    120 Gb SSD for OS and 1Tb data HD
    Internet Speed
    6000
    Browser
    Microsoft Internet Explorer 11
    Antivirus
    AVG Free 2014
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