First of all, apologies if you are seeing error messages when accessing some of our resources. We're working of a fix, promise.
If you have the stale request message above, go back and try the link again. It usually works on the second or third attempt, although sometimes you need more tries.
There is more advice on stale requests in our FAQ.
Some of you may also see this bad request message:
You can resolve this by clearing your browser cache. These pages show you how to do this: