Okay, the spawn area is crashing the server immediately on logon - I'm not sure what's up, and I have no idea how to replace just those chunks from a backup, so I'm reverting to the snapshot from six hours previously.
It's kind of hard to understand but a rough estimate can be found Here. The problem is that each folder can contain up to 4 chunks, which have nothing to do with each other, because of the ambiguity of the system. I could go through with my program and find which chunk is at your specified location (it wouldn't be much of a rewrite).
"That line you read, of course is mine, however, read so badly, it sounds like yours" -- Roman Noble
A simple utility that takes a range of coordinates (easy to get) and outputs the chunk filenames would be perfect. Then I could just run it into a script. Consider something like: