Thanks ............ but it is in fact like clicking the X on the history palette but it does this randomly on it's own and when it feels like !?!
Had the client re-install but still the same. Seems to be more when edited in Photoshop and brought back in to Lightroom ..... again this should actually leave more of a history trail "in theory"
Go back to your original raw file, that will have the history of the actions you did in lightroom (unless you clicked the "x"), the re-imported file (TIF, JPG, PSD, or ....) will have no history, since nothing has been done on it yet.
The actions you did in Photoshop might be saved with the file's metadata, depending if you selected that option in Photoshop, however you cannot show any of that Photoshop history in Lightroom.