For what it's worth, this sounds like what happened to me ( see separate thread ). It may be the case ( I do say 'maybe' ) that the timing of the problem, i.e. the fact of it happening when you returned from your holiday, might just be sheer coincidence. Given the fact that this will have paralysed what I would have thought would be a multitude of people, I'm surprised at how little mention of it there seems to be ( although, as in my own thread, I fully accept that it may just be me missing something ). You may want to keep an eye on my thread to see if any solutions do materialise, and likewise I'll keep an eye on yours.