Hi,
Thanks for the help. The images were in the folder you described, but I noticed that there was also a theme-tango folder at the same level as the open-audit folder too, that seemed to have all of the same images in it apart from these two and a few others. I copied the missing files to that folder and now the pencil appears OK
However, I'm not sure if it is related or just a coincidence, but then I hover over a machine name in a list of machines, I get the usual pop-up with some details but also with a couple of PHP errors in it as well (screenshot attached).
Is it to do with the same thing or something different?
Cheers,
Mark