Board Thread:Support Requests - Designing Your Wiki/@comment-26281081-20130828224359/@comment-1330470-20130828235228

I'll just retroactively answer you - favicons are very notorious for having extremely bad caching issues. That means that your browser saves the image and reuses it so that you don't have to reload it every time you load a page... However, it also means you may have lag when the image actually does change.

Good to hear your problem was resolved!