The RTB errors are related to the RTB webserver gently dying. I did some hacky install of some webservices many years ago and they seem to be crashing now, and outputting 20mb core dumps (bad error logs) around the place, which is causing lots of 500 internal errors and slow page loads. I've recently acquired a new RTB server and I'm just working on the new forums and download system we'll be using, but this is pretty time consuming.