!!! IMPORTANT FOR MAPPERS AND PARTICIPANTS !!!
Mappers and participants: Please update your sign pack.After the update all signs should work again immediately for everyone, even if you emptied your cache and disabled all peer-to-peer settings.
If you have an old sign pack already (Skins\Any\Advertisement\TTC), delete it and follow all steps which are mentioned here:
The tutorial below will help you in case you are unsure where to save the signpack etc.