i was wondering if theres a fix for the missing image on the "Working on it"-Animation in SP2013 Preview Google search didn't provisioned any fixes.. any ideas? Would like to solve that issue
Previous post is correct, however maybe I can provide some more detail.
You need to put an image called progress16.gif here: C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\1033\IMAGES
It doesn't matter where you get it from. I took one of the other "wait" GIFs from the hive and just made a copy of it and renamed it. You could also go here and make your own: http://ajaxload.info/.
The missing image is the progress16.gif in the 15 hive. Just replaced it with a gif from ajaxload.info and solved my issue..