Entity Skins Vanish

[Mudbill]

Are you sure you have no .map_cache? They usually generate when you load the map so that the game can reload the map faster next time. Have you enabled the extensions?
If that is not the issue, perhaps it's somehow interfering with the grandfather clock in the default assets, though that would be strange if it didn't before.
Are you able to make a new map and place it there, and have it work in the game as well?
Also, where do you have this clock located? You should place it within your own folder in /entities if you haven't already.