You are correct about the Matt's Script Archive forum. I ran a few 10,000+ message forums back in the late 90's that were based off it. They ran mostly without

You are correct about the Matt's Script Archive forum. I ran a few 10,000+ message forums back in the late 90's that were based off it. They ran mostly without any issues and only occasionally you would find a parent node's tree was not saved correctly and truncated. In most cases this could be manually repaired. The biggest issue was archiving as the main file would need to be manually edited to remove older threads. I had moved on to other things by the time phpBB was released.