New threads are disappearing and the reappearing. I had one last week that did that several times. Even going under my User CP and searching my posts didn’t find it.
It just happened again with a SCOTUS ruling on DNA thread I started in Mundane. It was there for a few minutes and someone replied. Then I replied and it disappeared.
I assume it will eventually come back. At least I hope so.
It seems like a database error. I’m not sure when the message board does a final commit writing the record. Are new posts getting written into an overflow area? That sometimes happens when the index is full.