I'd been having GP problems and it turned out that the C:/ drive on one of my DCs had zero bytes available. OK, I bunged it a few GB in ESXi just to keep the service running, but it ran out of space again a few days later. There's a file called wod.log taking up 36.5GB.
Anyone know what it is? It isn't present on the other DC.
The permissions give nothing away, and of course it's too large to open with any editors I might have on me.