Sure I'll post a pic of the leaves this evening. The leaves in the photo here do look fine at first glance, but the unevenness of the green is the first stage of symptoms. It doesn't show well in the photo, but there is some faint but noticable streaking. The plant lives in isolation in the kitchen (with a Phal which I am suspicious of) and has its own container for watering. I would have tossed it earlier, but I thought that I would at least enjoy the blooms so that keeping it 18mo wasn't all for nothing.
I think I'm going to buy this book,
Viruses in Orchids translated from Japanese to English by the the Royal Netherlands Society of Plant Pathology. A colleague forwarded me this a while ago, knowing that I'm into orchids, and plant pathology in general.