Problem w/ some rot and thrips in the kitchen nursery, canh, Phrag klotz and flask of Phrag Josaphine Boneparte.
I see. I've just discovered this thread and instantly recognized thrips symptoms in the very first pic you posted in 2008:
Weird loss of leaf pigmentation on some Paphs!?
[rant]
Too bad we don't have a decent pest and disease forum section specific to paph (i.e not the rehashed all-purpose S.Bottom pics) with
sumed-up symptoms, attempted cures, and preventive behaviours.
Sometimes, the identifications are grossly wrong, or people don't provide the slightest picture (aka "there are black spots on the leaves, what is it ?").
Other forums are no better on that side.
[/rant]
I've noticed thrips crave for the purple underside of brachys, delenatii, micranthum, malipoense, canhii and the like. They may even like rung.
I would be deeply worried if I noticed that on my plants. Spring is coming, and they'll have much fun.
Btw, at the peak of their invasion, the most affected plants showed signed of erwinia. Guess the trigger...