Thanks for the heads up to check www.hilton.co.uk instead of www.hhonors.com, the latter being the one I usually use! At least the UK site is showing that the correct history informatoin still exists in the system, just the new US site is not pulling it all out of the database correctly by the looks of it.

What a mess they've made of it! 4 stays at the same property in Korea in the last few months have just vanished from the US site into thin air, although the points balance is still correct. But stays obviously is incorrect, and where is the nights calculation?

Are they aware of these huge problems? Don't know if it's worth writing feedback from the site or not.