Is this bud blast in Miltonia NoId?

[Hedge]

Hi every one,
After two and a third years of waiting, my NoId Miltonia/opsis has finally put up a flower spike. It has suffered greatly due to my mismanagement, and as you can see from the picture showing the whole plant, new growths have been very stunted until this last one (on left) which has produced shoot.

It is currently potted in coconut husk chips and it took it a long time to recover from being repotted - I think I kept it too warm before and watering was erratic. Now to my dismay the buds have gone brown (in last 48hrs). The plant came in bloom with white flowers so is this bud blast?

It is in a warmish spot not in direct sun, as the instructions it came with suggested 50 F to get it to spike and 60 F when in flower. Did I get it too warm too soon? Please advise