Interesting post. Richard, come to think of it, I'm experiencing the same problem. It's not just PPrune (I'm aware of the latest policy) but many other sites. Despite ticking the boxes on various site offering to 'remember me', I still find that I have to fully log in each time. And this is a relatively recent (within the last month) change. Is there some bug or other running around stopping cookies? I have checked all the settings I can think of, but to no avail.
I would appreciate you expertise on this one, Richard...
FJJP