I was at the Alejuela Costa Rica Orchid Show over the weekend and I bought a sample of this plant i bud. I don't know what it is and the person selling it seemed not to know either although there is a language barrier.
When I touched the mount, part of the lip quivered and flipped up towards the column, so I am assuming it is insect or bee polinated.
It is a Bulbophyllum. It is probably a hybrid, with considerable Bulb. lobbii in its background. Because many hybrids with related parentage may look similar, I doubt that a definite ID is possible. But the care for all of the Bulb. lobbii hybrids is similar.