One of the other things I fooled around with was in Display prefs>Colour
Tuning this display using expert mode, ahem, was giving my eyes a better result than in the past.
Default gamma of 2.2 - but really a nice picture. Hit 1.8 and it blows out.
I wish they'd reverse that and put the gamma and white point at the beginning of the tune process.
I would like Apple to beef that old girl up (Display Colour) - the flexibility in this display almost demands it - wait no, it's...