I joined the server yesterday and found that some of my sounds have gone missing too...it's quite annoying.
I have to double check chat every time I buy a tome because without the sound I don't know if I bought one or not.
It's also quite unsettling that I can start flying as a santa without hearing the bell sounds...

I'm quite surprised no one has found a fix for this yet.
I'm assuming that we should just delete some files and let the server re-download them or something...but I have no idea where to look in my folder, or what files need to be removed.