Yeah things were really rocky for me for a couple of days. Down completely yesterday and periodic "bad gateway" messages earlier today. Seems to be working better now. Was refreshing like a crack addict :/
About 5-10 minutes ago, each time I'd refresh I was logged in as another user. On a side note, what's it mean when that user's header is cyan instead of orange?
CF can cause a small DoS as it does some aggressive pre-fetching. So your server needs to handle short bursts really well. Not to mention whitelist CF's IP space both in the firewall and nginx rate limiting.
This might be unrelated, but I'm constantly being prompted for captcha even when I'm just viewing and not trying to respond. Can something be done about this?