I'm pretty sure that Ilford changed the emulsion (without saying) of the HP5+ (and Delta 3200). On my new 4x5" negatives (developped, as usual, in Moersch's Tanol), lots of black spots in the highlights!... Wolfgang thought it was because of the high alkalinity of Tanol (pH10,5 I think), but a friend of mine used D23 (+Borax) and had the same problem!