"Definately something screwy going on with the time and date sequence of posts yesterday. Either the pprune clock is broken...."
There is a known database fault in the post date/time stamp.
Currently being investigated and - hopefully - rectified by our IT specialists.
"What's happened? Was perusing this thread early last night and was up to page 158. Now, 6 hours later, it's back to page 152. Any reason for the loss of these pages?"
Because some posts were deleted by the registered user,
not PPRuNe. That is the user's prerogative.
Tail Wheel