Unity 4 Project Tab Hiding Folders!

I’m having a strange bug(feature?) in unity 4. If i begin the name of any of my folders with an underscore like “_Models”, “_Scenes”, the folder instantly disappears from the project view tab, and assets inside it are not visible in search. Does anyone know why this is happening??

A quick test, and I don’t see this problem here on Unity 4 / Windows.

Perhaps delete the Library folder and let the project rebuild… ?