[Ranylyn]

Confirming that it could very well possibly be a client-sided issue:

When I was a new player, I was stumped at the Jammer Caverns since the chest with the chainshot was not appearing. Ninjahz had to explain it to me, and I cleared my game files, redownloaded resources, and boom, it loaded. During this time, everyone else saw the chest just fine. I've actually had the invisible chest happen once or twice since.

Trust me, Dev's not just being dismissive. Firsthand experience: It's worth trying.