Looks like the same thing I'm doing battle with.
Here's a link to my thread under Pests & Diseases.
http://www.orchidboard.com/community...-outbreak.html
I went the systemic fungicide route and it seems to have stopped it for the time being. I drenched all the pots and did foliar spray as well. Repeated the whole process 7 days later. I'm not sure what kind of fungicides you can get in Canada, but look for something with Thyomil in it.
Don't wait. It went through my Phals like wildfire.