Abnormal mottling on Paph. Druid Spring

[CMW]

Hello!

I've been reading for a while, but this is my first time posting, so everyone

I have a small (ha!) collection of about 60 plants that I grow indoors under lights. Anyway, I bought this Paph. Druid Spring (which is druryi X primulinum I think?) at a local orchid show in Spring of 2013. It was in bloom when I got it.

A few months later, these white chlorophyl-lacking areas appeared quite rapidly. As of now it is putting out new growths, and these too show are mostly white.
Any idea what it is? Disease, mineral deficiency?

(I attached a couple pics but I'm not sure if they stuck).

Thanks for any info!